Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6da12f4d626220e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 22:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 6d93116828d7c7b8d0f988dd18d51320 SHA-1: bf9a07e8ca5463517e46eae7c43d29e53a4314df SHA-256: a6da12f4d626220e3def04568184d7ec3489cb049d1ac3cb12b9d347e3f7ce74
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the conclusion that this is a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://medeeatour.ro/mm/file/390242527.pdf In PDF document text
    • http://artattack-concerts.de/files/file/sulujiridetuvewofexapuman.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611df400d6491---gibanuj.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/jobetanimedigakefumep.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613467eb32a3a---zipusixujamidi.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/zedafadozij.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/tuwabifam.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/sadoritirof.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/wozegedolavebenijig.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094e2c44e332---61369814568.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/96013103867.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffd16d8288---debivofef.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/21595371504.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/67759160386.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c29e2d5e5---mefepidone.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/88262868705.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/tunimusoxeserenoregibu.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/60480880817.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098743c4aa53---nurejo.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/20327207586.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/wuzafatakofe.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/rijaxizugoliturevonatimuj.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/6321386600.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8436edbab9---16781424531.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/652e3ca074de96d21acb085ed006e9b1/dirasebedibufoputunu.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/33653017541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=anemia+defisiensi+besi+ibu+hamil+pdfPDF 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_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 10668 bytes
SHA-256: fe8c6799da74e61cd2e5f683af93f83a158907bc6fb12eb29b40f33e0bce729e
font_01_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 16764 bytes
SHA-256: d273e53570d9e3446576be360985866f94cfd261d5a2d62d184374bc78d496cb

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