Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1db8f7c90a622dd…

MALICIOUS

PDF

99.1 KB Created: 2021-06-29 06:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecd685cdf6c262d8d9f570105ab6db23 SHA-1: dfee31142417a17cacdbace8f72b8dbdda7f4554 SHA-256: a1db8f7c90a622dd3f1368883127d5dbcaef8397a8bd5700234f44f3ea3639a6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://cructi.ru/uplcv?utm_term=how+to+change+compatibility+mode+to+normal+mode+in+excel+2010
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098670ce7b7e---19597992712.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/qpfguh91jm4uso1pamlipiqsh0/91181982130.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5a21c2f1---5593951360.pdf
    • http://aven.su/userfiles/file/jeguxewim.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/308469522ed1c0c66e31f6fbc311c879/dovokisedabizedisojajita.pdf
    • https://skillmapmagazine.com/ckfinder/userfiles/files/tugisixubesukotizowifin.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/gg0n26ct1gcgm1o02kistmvntb/fuvirogekuf.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608be7a331d34---fabikagisejawivufovilasu.pdf
    • http://language-coach.pl/uploads/files/fexivadepomowudo.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8ec00b9f---85579684954.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/84175206b0a1a807e6a6febcc946732e/nozaxupumorariga.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160945c519854e---43176559341.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/75f9c6b01b673555fbc305d231294139/83720977781.pdf
    • http://espokebar.com/uploads/files/dotol.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/n51qpf52qh1rj96em0afh2vp2h/3570799922.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083611bf15db---42390995592.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/45e34bacd982f96f5cf7a94af547c261/88920001435.pdf
    • http://asokmontridental.com/userfiles/file/lovoxamuwobeduwapadi.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0389a2908995f5c22f54ebe31f6e006f/ledufipebe.pdf
    • http://smclassof57.org/clients/34860/File/retunujodekunanemupubaxur.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c21b6787eab---kunesokoradowixivexadogid.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1bf7dd07e75b15e7a7bc1bce06eb9b83/87368563400.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fac2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 16792 bytes
font_01_sfnt_off000112d9.bin
f9db1d2c42e0b8b6307fdb3c3ea718a642bd1de1a68dcc30aedca1de25007b72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 11520 bytes
font_02_sfnt_off00012d95.bin
b088add9637f968672e7ad8a3b9c8429b27660e257a1363f7fc41933c28084e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D95 29176 bytes
font_03_sfnt_off000168ad.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168AD 16140 bytes

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