Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc1810d24d3f800…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 16:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c806b6e603915b26cf9f1c3c3fc32c24 SHA-1: 210a09379d6255a7182cba3f5447be2d43db6844 SHA-256: 0fc1810d24d3f800a3d54938611c6359b93169ea5c3d5d270d1652d28b7584e7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and link farm indicators supports the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=vidmate+app+apk+download+new+version PDF link annotation
    • http://innotack.com/userfiles/files/fulow.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/94811499798.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210911_185922.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/nusagogosidozexamajepeput.pdfIn PDF document text
    • http://dakmet.pl/upload/tafofabe.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/garurobozijilemopedora.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/84087831595.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/75317753113.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/gofodepewonumes.pdfIn PDF document text
    • http://poliinc.com/upload/files/vanosofifijixek.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/jabovuwefome.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/28370244239.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/52189963160.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/pigitudopola.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/65680620126.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ueb35n0cotkepe3f4n8pukmkt6/9450315672.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1728daa60---pefekagebubifosijibi.pdfIn PDF document text
    • http://status.cz/UserFiles/File/lelurazuzopufosil.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109151457252937.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/lifuviked.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/kumuwumamunifelarerofe.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/19326580319.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/2370452719.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/juzisinesiduxor.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d59184bdb2---damegavexopijaguz.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_off0000b526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB526 16480 bytes
SHA-256: ddcfb9079ddd3032d9948c0a4e69715dadf014f3530134a02eb85f02b433c902
font_01_sfnt_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 10768 bytes
SHA-256: 690bafd18de37bfd659d232fe90fda8d7b71204e67baf4bffb544fba966afeda
font_02_sfnt_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1