Malicious PDF — malware analysis report

Static analysis result for SHA-256 851c0aff661ead77…

MALICIOUS

PDF

84.4 KB Created: 2021-06-29 09:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5eda6d6563cdfdafd0e20fe312ac7a9c SHA-1: 138ecca9d3c01bb9b250145065505078bf1663d7 SHA-256: 851c0aff661ead773438837abb6d0cbd7cd37a0007365c424a17cee24e4c92c1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through indirect means, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crewmak.ru/uplcv?utm_term=god+uses+our+pain+to+help+others PDF link annotation
    • https://yssnewlessons.org/UserFilesTwo/file/tazujebutisopagizonivu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/bce556d750260300f2969ed1c12fde3f/90445517627.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/1bc53cbd1f0b6bf5c155177cb8cabf0a/wiwejis.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/8451018766.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/28637227676.pdfIn PDF document text
    • https://actorconseil.com/files/file/jijimajunexobegoz.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/282c54dd5ff8e2f4fa82356ebef5b306/peraxoduwutikinolenape.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccba5c658b---81210020119.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759534c7a50---44169664933.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c8b3f7a7---31987875337.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/53260313705.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/fizepupo.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/timodopuluwu.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/vekebugaxegobuxibaf.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/c30cd503aad9d252a3dfd7f2c1797b4c/31392787419.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/40844279192.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8e9fbb600---losoletizalifupirigud.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b747853b912---69196950765.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608609e5d1807---zadojatanogew.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9b1147e6c2503c60a66d6310512c68e5/bofivozuxevafenuzidozuw.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/bp7pi9vvbl9tnttdtad34kba5n/lovodelotiputolo.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/75861204636.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 10628 bytes
SHA-256: dd0440b173175393eebcead7c415f6daf37f651c5635b73dfb6463dc229d1113
font_01_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 16356 bytes
SHA-256: 0ecf59751fb8fd4d3c34a6c15c14ffc107ca7d7107467a25c97f90091a65fa42
font_02_sfnt_off00012c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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