Malicious PDF — malware analysis report

Static analysis result for SHA-256 83354b3320731dbd…

MALICIOUS

PDF

96.1 KB Created: 2021-07-02 12:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b56b6b8c224cd0c83769653e6c145336 SHA-1: 0f20aa0e2301407fc71882c719606f57557d5c08 SHA-256: 83354b3320731dbd26e8a95a3e30d5cdfdc7f821fda6e90ad4020f99d763adef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. These links are likely intended to lure users into clicking them, leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a39249232---63523885644.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9df167d923---32404861002.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/31447217373.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/59452721157.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a98313d87e2---76362062949.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c16cabe6118---komivovixixuxusi.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/205075a58ee98ce74d8f8905ef31044e/4915081474.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/gamidinokus.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5302edfe14d90ce0e69f7e5a8a866f0e/wanopaxewojifiramov.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/47584575539.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca493121ac2---belegamelojitoke.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3589d0773a---73694920607.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c613f7e0973---tovulomowepesopof.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c30b23b47---bumukenirepiv.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1af9c07c29b6829819a52414e3af6516/30355610291.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5a4b5e5d---gipozedabeloga.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3vlm5gvajf4ug1c85guuhdh4e3/82629398582.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/91611440247.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/16908164890.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/960a018bf42f634ae1ec95195a062a7d/gafazu.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/4210057451.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/10e46cb23038478df8b03c613f2633bd/vivepugoduri.pdfIn PDF document text
    • http://greece-ex.com/sanometibokixoralawijoxem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ribeye+in+cast+iron+skillet+then+ovenPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 17808 bytes
SHA-256: a9ff4207567b71d072dce217a3833e64c316308bc704e2c54c1dfbaa66d73187
font_01_sfnt_off00012c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C03 10784 bytes
SHA-256: c33db3bf2c287d43bb1c27183e5b707cc5212872fde831a7250bfad852f76ef5
font_02_sfnt_off000144e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF3 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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