Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27a4fad31686001…

MALICIOUS

PDF

85.2 KB Created: 2021-08-24 21:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 981a6d76646f2727c97d1e1e2d84709d SHA-1: 7a41e7ae7618b1f9082955fc12514b5a29f8c64a SHA-256: f27a4fad31686001014ac5c4da0091ebb4000caccb158f53b5d4dd9a76c906c1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3f1d4c07947e75f92764abe39aea1c35/45742820300.pdf In PDF document text
    • http://nuraski.pl/wsg/userfiles/68788689992.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/govizekesij.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/dda9febd3eb6277382d5027247e65f53/19326655222.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1bf3e93ccde7cf94a96c70d886312835/xejaxemofaniko.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/fizajeralezupise.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/a3eccd14724637bacca162d2b0e28f1a/lewowikuwududir.pdfIn PDF document text
    • https://penal-garazh.ru/files/49047669281.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/54517818994.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/vapoxisisedijevuziri.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f109cec43f5---13938834066.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/68401b13479b62fd4daaf608251e5ed4/pipize.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b173a6ce8ce---wevozinar.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60474630a---45162483112.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9e03b9bbc00e75377f4af0aa25f47d93/rusaveve.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/65973e1dcdfbd4960b65bbad55f64957/40379194912.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1ebfeb4d6e90bfced13d9c1a3403f30b/zijanatiwer.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/85ed5819024005bf742f2c88a3cf81ac/bitejixa.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/3fbdqb2vjmoecftmd399ob2nc0/tomomenopamebokelud.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/wanadimakazegoxomi.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/kalasivalafasavojukigix.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/34gjpn1k2shte5uj7oromt0nmg/77027416053.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1066695a1---45213013578.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///rogonasolitasowusowipef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=inches+of+mercury+to+psigPDF 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_off0000e85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 17092 bytes
SHA-256: 91eb64729d0b1a4f7d4409e002801ffcb02d29c797d8c490e846c7ee0ebbae04
font_01_sfnt_off0001150e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D25 10884 bytes
SHA-256: c6cd93cf6dad569e1d71885d294ff1c85f7785dc78f02a7a925c9f31540c48fc

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