Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77326454a2d5c3f…

MALICIOUS

PDF

85.1 KB Created: 2021-07-14 06:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8ae0e94ead7a003d753fb736613c76f3 SHA-1: b4aea9c9167fd52007ac2a6deb8a1deabe977ab4 SHA-256: f77326454a2d5c3f863a54abec20337c0892a236ae4e25b41b2f0a355cf8fe98
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings are sufficient to determine its function as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160868df07d147---95248045879.pdf In PDF document text
    • http://alimentosldm.com/userfiles/file/luzadidalagotasogat.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c897ec2305---61343432031.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c56a6e71c5---47424690120.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/mdfg0pdle6n6t82vk07qd5s8b2/fojorakamol.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/rugerobuw.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/naqsnhamavl48otgehvk22ql0a/ritamutizotojelezebe.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb518e6bff---pesurex.pdfIn PDF document text
    • https://melz-feu.ru/upload/51889375812.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/xadevubepikilesin.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/os1ufhvebsebscoitfl59c3o72/80218295959.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/12f067cba7dd3b997912c157268a3d39/vuwobeletujowotulopat.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/3177756390.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/3efd32e03f9ea8d4e4383dc7e2ff8d83/28189101676.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/lodelotezosojuwik.pdfIn PDF document text
    • http://npas.ru/pic/file/wexapuxase.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7af6e5c1---fexibidu.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/29704429105.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/212724eb7aeebad702ff13220eb4d90d/13594057931.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/37152447064.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ad147f9096580bb894b7ffee3049a9ec/mivirawux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=introduction+to+computing+systems+second+editionPDF 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_off0000e4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 18104 bytes
SHA-256: 6c387582866c4117eff81dc9d62e11f6d9d690e3fce0e4e32eeb2259ef2ae18f
font_02_sfnt_off00012c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C96 10812 bytes
SHA-256: 852037e977458271a4f44f6b0de6d8bee16e39426b062e34a0c2dbfd8cdef64a

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