Malicious PDF — malware analysis report

Static analysis result for SHA-256 a984a4a1817b0bc5…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 18:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ef49ae7162cbb0d56fa0dc39b577b7e SHA-1: b99edeaae7765e98dbbd0f9b6ba4fd93d6f30169 SHA-256: a984a4a1817b0bc58955dce738a2e1d1a384eec47fe41630923fb1c82949b20f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which are part of link farms hosted on potentially compromised or disposable domains, suggesting a phishing or scam campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://oniceh.ru/uplcv?utm_term=best+video+editing+app+cracked+apk PDF link annotation
    • http://nanouklid.cz/upload/file/61869808162.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/94940352053.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/96643051335.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/fivomedik.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/tozarimanobuvamogexi.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/mewadagowasa.pdfIn PDF document text
    • http://jadeite.ru/images/file/98089162057.pdfIn PDF document text
    • http://cpviettin.com/upload/files/jikob.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/meladitulanowoxuzumidutax.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/77770127017.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/32982539449.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/30727108131.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/79803106812.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320883617c7---xetegovejiv.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d32e93248d---jopojusizitibisun.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/dazemupox.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210905101146_4nkb1b.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/sowekotuxowipavodugakarap.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/tironafatu.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/64800669652.pdfIn PDF document text
    • http://rafaelokazakov.com/file/lalozesezazedipup.pdfIn PDF document text
    • http://regcureguide.com/files/files/pimetamowiwedo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b888b4f4f4f68d0d950746913cf5504f/82009787798.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/sipira.pdfIn PDF document text
    • 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_off0000c277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC277 19084 bytes
SHA-256: 2181d5c4b6a76928c6efaf13410f3ef0bffebb7e49a15d61c8778e734c0b90fa
font_01_sfnt_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3E 10852 bytes
SHA-256: b8b0ea8ba4737e6e64f6f0684901f6d255e7c4cd0def503f3a2fe3cbff2fdfc4

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