Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d2f52761bef73e…

MALICIOUS

PDF

108.9 KB Created: 2021-07-28 03:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eae54b74afab72b466c4b16e955c7613 SHA-1: eb1680eb8e1caa5baeac693ef925ac40421a4541 SHA-256: 21d2f52761bef73e032239abfdebdede3b88b5c4c56695c476a708e0db8af013
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://cuisinescartier.ca/upload/editor/file/32344244529.pdf In PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac592bf102a---lebozuravoxasawibuxegun.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/72873414347.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/3396442558.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/fefabuwonuzun.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/gewufar.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160fba18d2135f---27042764699.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4ff7c45cd---kumoxuwilizoderonajokab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983bafc1dd4---lakojel.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/88990095514.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/lobenixobuzak.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/456da5f9307a182fe62830b43540b645/fujapi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mirovatuwanumiwenovepuf.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ef0bc4ac79f7d6699c57339ebfe3f487/gezojesuwufemasama.pdfIn PDF document text
    • https://actor-conseil.com/files/file/zedoxemar.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/peneraforoxonune.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/pezenexokogevowufinap.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/tobixagiferuxigiripizugi.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/josopupuzovegug.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084cac70460d---8826430852.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/725d7rn718837gjtobset4afl4/71259878727.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/8038269174.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/8e526a3f7c52c0b501e7b55f781d2c02/kagidev.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/14177008663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cle+international+grammaire+progressive+du+francais+avance+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001176e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1176E 20040 bytes
SHA-256: 596f85447fa9add82dc9d605a24512ec32d37551753bfe375faaf5119166fb33
font_01_sfnt_off0001393a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15151 11160 bytes
SHA-256: 260e8887e6e02709c7db5b8f0abc7bb052d95e8f36a52b36e1ffd6e115044d02
font_03_sfnt_off00016b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B3D 22964 bytes
SHA-256: 0827987474a9a3d22a4fed5baaaf69aa5e7af0d0d38d3c458c475b4a566b144d

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