Malicious PDF — malware analysis report

Static analysis result for SHA-256 2628c603db52884b…

MALICIOUS

PDF

89.4 KB Created: 2021-08-05 18:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06b65e5c9f905445c5ae80e563b497a1 SHA-1: 24b55dc43d944a9fb1c482bd6d6e2e3ce0b99a00 SHA-256: 2628c603db52884b103e5216c4ad7aa652ccead15dca175bbbba23e125d682be
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary function appears to be distributing further malicious payloads or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://laborke.ru/uplcv?utm_term=attaullah+khan+new+songs+video PDF link annotation
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/85918131103.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///jojezomivepoke.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5469d9c3ecf7391bdbcf1057ae76c9f2/18521528178.pdfIn PDF document text
    • https://susta.vn/userfiles/file/jolezogupobuwulosomodex.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd7c2c866---milar.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/e1l1hndqsls81ao6mj977opbr1/mozefevuxamefevonesikome.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a79d8f75f10972c7f06658b29c284f6c/zebegorujiwavosirabufoxe.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/dibopanurumonoro.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/ledupewinedo.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/60390544372.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a552b7fcf---83967820167.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/86ln44f11cfsnciaqamn0f0p5b/mugobep.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/25381466709.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077588ae284c---92802888776.pdfIn PDF document text
    • http://scro.ru/pic/file/12910307715.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070329fc78c3---wonawujimudesalun.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/leviso.pdfIn PDF document text
    • https://autopratichesas.it/file/18330212235.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/1057315575.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e906af4a61c11db9590061de1fdba9d7/jupikonon.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/18409047011.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/34967617055.pdfIn PDF document text
    • https://birotex.rs/images/files/26546709770.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_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 10752 bytes
SHA-256: dc99339f7a7420e7b19f3be0e40d32668a55786baa1e0a54c4cdaf35efc356de
font_02_sfnt_off000128e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 17680 bytes
SHA-256: bffa2f040565d0de466b42be43ca1a6c6cc39d2e68af64ed249891541d1f09ac

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