Malicious PDF — malware analysis report

Static analysis result for SHA-256 71140681ddfe365d…

MALICIOUS

PDF

94.0 KB Created: 2021-08-27 11:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33189e20a2f4eb2ed954bd0bd359e1fc SHA-1: eb31ac5f203b1f1538b83a85e3c415b05ace24fa SHA-256: 71140681ddfe365d6f798bc83364dc7291175bd63905b4067e701c18d0c4ec54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress upload directories, suggest a link farm designed to redirect users to malicious content. The presence of external URI links further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nomylo.ru/uplcv?utm_term=sultan+full+movie+for+free PDF link annotation
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b38d6cfcc---nadupavuzafalifilofovoti.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/76467892139.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0dd9009e824a11abc7cc8e94d25b0b7b/pabunututitis.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/e695990c9c953436b164d0be196ff6f8/24569474607.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd5e4a8809---dogerinofivinunuxez.pdfIn PDF document text
    • https://digireg.es/upload/duridexetodurenedi.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/xigefotoxuvuxa.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/83644755488.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/puxulusawipugak.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/xibikurilujavajuxifilope.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/i6a57smdidft6cjk2rh55bhm54/49261362175.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/10435769009.pdfIn PDF document text
    • http://distributoram.com/files/file/98978089844.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/4b8lqbs17rko7kc8g8qdf3pa83/dudosazuzijavodaz.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/18694880259.pdfIn PDF document text
    • http://agrion.org/upload/fichier/sovidojewazibedufej.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/nulinijexevavinufalixere.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/56f2702734292ea98acee3c01742706b/50514051023.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/1a8ddfaed36da8d72cc87ace11cfc855/tiwefusiverajirifedurilo.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/vipuv.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9501711795.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/17027635178.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092a9318604b---parotugaxu.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/guwezajijisoko.pdfIn PDF document text
    • 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_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D7 10448 bytes
SHA-256: e7d7d992ceab19ca1ad8b5a56aa53f1ae62341ad055fab5d6a16446497c19573
font_02_sfnt_off00013e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8D 16660 bytes
SHA-256: 2e18d04f6125167cdcfd1d3b3b353f443a388f2ad584510064df5f2bf0d03815