Malicious PDF — malware analysis report

Static analysis result for SHA-256 867f1eba4c9809b0…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 16:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7ebf65a98f6a1cfde9ad8b38bfcab9e SHA-1: e1500f9e00241f5b2f9ac3381bd5770cbc2d1fad SHA-256: 867f1eba4c9809b077b0d863bdbd1c5f891b7be0e5ee60bb1fae716a858d5eeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cmoretv.com/userfiles/pujewuvadokaxivapifeba.pdf In PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/nogewawalum.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/16099039211.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/85111280888.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/8348292746.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c448a16fe---wevisunobof.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/be154383a75273997b169ada826f1417/6603371216.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/44461286204.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/vomoma.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/wakijifapemusexoj.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/39d99c49284d1437f11c66cfabae0070/vitifibagogomatalifi.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jasobese.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/49122909754.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0116a8ac93---96649143716.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/98824975671.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0ca5ff0b461c64a6fae29d972e7f127b/49261436240.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/suxojuzimemagumotazi.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/somusuv.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/bigali.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dc5bbfca4---goxasusopux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=thomas+hardy+the+woodlanders+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 10836 bytes
SHA-256: 057f393835211fb8212e68af82d43e4c9b8a65edb2a5dcb5feea3f0155203e47
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 18008 bytes
SHA-256: e9a95eae486da766760175a84c4347cca8d2b299b9f99bcbf3698337f31d3fbf