Malicious PDF — malware analysis report

Static analysis result for SHA-256 704d12adf2fe320a…

MALICIOUS

PDF

83.9 KB Created: 2021-07-17 14:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c938abd814bc27422be36c6a710c505 SHA-1: 34ce6244275ba657c05c5d34cc5fb88f53e82caf SHA-256: 704d12adf2fe320a160430027e77b0ba2bc56dd4f5843a9bb2f5460b40d14778
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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 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 http://www.empresshasnoclothes.com/siteuploads/editorimg/file/gibutugogisen.pdf In PDF document text
    • http://sosnovgeo.ru/userfiles/file/ligesi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16085f3847f315---tefinatanogoberekoderozu.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/xotebivoxatowugureni.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4f4796dc---seterilew.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/garabasejinosujot.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/016f0e46c624fa4501d4498282a61f78/tizisujazexe.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/7067480938.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/jlea9j9kjkfqv0a90hgvas7td0/33950905496.pdfIn PDF document text
    • http://temple.mo/userfiles/file/rosufosikiluvuweseniwujup.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f922c6df2f---degotogowogo.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7db547bd2---vurazinedavifezupaporag.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608863e69cee8---jifepolumakimatetijujular.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/t8g7de73dfmmqa2gf5jm2m610e/jupelujuxazewudo.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/wamavutatuvanaxawirizer.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962da09ce8d---febanu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/62463292c8b348cddf157b75eb2fa0f9/11074048103.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/vejete.pdfIn PDF document text
    • http://efrex.cz/files/file/kawolokifugogenexijix.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609641ddb4aa3---fetekaxafidiju.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/22016922125.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/1745510405.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c750ca1b0e7---punujebanegizuketutep.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/xolinedidubokariwelel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=holt+algebra+1+chapter+8+cumulative+test+answersPDF 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_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 11464 bytes
SHA-256: 398732165dfbef60c2eb229875d9e05636f9b7c998a5e95f9f40450f5fcd9862
font_01_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 18632 bytes
SHA-256: d8bb2a82cb75aa24f6f713db49a5320780bb234759324750304155bd9589f9ce
font_02_sfnt_off000129e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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