Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf33eb4443b8e07…

MALICIOUS

PDF

98.5 KB Created: 2021-07-18 18:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 30c886195cf26df8349052619301197c SHA-1: 94fff7b8bd1d62ea50d7ccfad4072b0d7f3b5f2b SHA-256: cdf33eb4443b8e07f435755b294cfc958d27cab1c0af9ca1211e12575ea32ae9
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a credential phishing attack, specifically impersonating Chase Bank. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=black+lab+and+bloodhound+mix.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e01ed5cb1---fukapedegemixuw.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jccmoo4dte6at7afinia85ipq1/tilobuwivelorofade.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/fafejamuwekupigalev.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/70048402571.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/2j38ivv62dj3aam9v0hrv8klt6/97459033133.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/528cba7f5fd7b3f0b1f6ada284aca258/15607821381.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e9bfbf50060666125d176510debe73d9/63861037942.pdfIn PDF document text
    • http://fxmeat.com/upload/file/b60372a091d12d87826d469fc14c0181.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e321b3252---jewetefotodikifatos.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/q1agk0hlgv7d9s4uhjiugqo417/fesesumazera.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eae78e5b0---55032637626.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/62225624463.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/bemopolatodobujeluvujo.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/f845a9sfdnhruls1ldm33801al/juwitinutirab.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/5998791607.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/25327536325.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6a3c8367f497364d26b3023e26d2cac1/pedinofalazuzul.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/tafidabaselubelitobudev.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/7dtrj6f04vmdhc757rkoij19r4/gotufenorigemon.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7bktks3lb9thn1742kn9hfour6/ligavimiruzazoxalipaz.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/55098546573.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/gibuzaxigo.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/13157596535.pdfIn PDF document text
    • http://markone-tools.com/upload/files/vokaje.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f200a99ecdffbee37f0cb35b5dca3318/rovikabomaboki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=black+lab+and+bloodhound+mixPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 17068 bytes
SHA-256: 502fe9bfd9d81799cc4dfa6bcae3e5b9e1565ea2fb3d12c49179f3ae38c2fce3
font_01_sfnt_off00014ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E3 10624 bytes
SHA-256: 38cd86d3fb1577b1e7322374e2ea41f5499218386b202271e490a85c19a61cad

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