Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b2d71eb0465499…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 10:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7d047d491bbdce7d7ae4d98542dcb60 SHA-1: 567b1622656a44f141ea597d5bfda9fc24046d60 SHA-256: d8b2d71eb0465499ec098b1fe7c739e2a22070c0bba9f6b8c5ff63a0168b6bbf
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to distribute further malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://vntdc.com/upload/fck/file/5081982171.pdf In PDF document text
    • http://totoquynhhuong.com/upload/files/vukipipezoxomuwa.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/59164825015.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/xefixexetuguninuz.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/wodax.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/gefebisibo.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba88d96b0f3---lilexot.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b77fbfcc003---60161808630.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/kiwojominobabakojosa.pdfIn PDF document text
    • http://airfa.it/userfiles/file/wiguletapizomolivuzem.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a426f6231538a86fb7a9ee4d627f338f/71767507055.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/motazofakuduru.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/12443404258.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/04be50fd2166292bbc12828fb459c912/44532457331.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609425ada3892---fiwojerojedogamum.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/rep2j5flduf4qmckcbnjfs6dp7/79274279697.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/sufemexavufebitoj.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/pibopipiwo.pdfIn PDF document text
    • http://okun.su/upload/file/77288947677.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/rikoda.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/tamulavogetunowusunivi.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/64334888685.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608be252e2207---1818509456.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c69b332b41ebdde187053c86d92f176b/gofinulufowonugozijuwon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=percentages+worksheets+freePDF 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_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 17476 bytes
SHA-256: 1031fc5c3f280b531ff31a39d0ce6cf5113031712ac6ff07d973283138ec20b2
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 10656 bytes
SHA-256: 8a37f5fbfc1db1070d2c129421428b92892a0e7e9fe26cca4905c4b2d17a4f36

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