Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1c6d3bce38c604…

MALICIOUS

PDF

119.9 KB Created: 2021-08-09 23:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f6e503027fad17a01d7f377e82cdcc15 SHA-1: de58bb869737949d9715b11b02bcc6287d08038e SHA-256: bf1c6d3bce38c6042ddb3eb0ac76b1fe9839e74a010c5918b4b964de3c147cba
156 Risk Score

Malware Insights

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

The PDF contains a link farm designed to direct users to various websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or engage in phishing. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces the conclusion that this document is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://mu-rrrc.com/userfiles/file/radoduzebipala.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7eac54b64---59499140370.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210723_054833_146.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210731_010201.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-16/20210716131623349419.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/74171510233.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/gojexapawegisas.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/a76fsois17h83pkharibpvushg/9735479519.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/83616311549.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/771e48e4c32ce5e3fc96eaaf56a58271/tekezonaf.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/10004941686.pdfIn PDF document text
    • http://ping-property.com/user_img/files/6659821.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f0e178ded137dab0ab7e6ebd2f33e91d/41925502516.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b39453a848---mipusujofanaker.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/sigesut.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7f1e78e2dd5de48bbfbd99a280a90505/98724130112.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/fiwuje.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/11218978a54c7dfb8dd471b33f542153/tubonezapes.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/69031747488.pdfIn PDF document text
    • http://santeh.md/img/files/12080464365.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a055e1b3d8e---weraladofutelinoxagokafi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/669d2b9cdf86d60ddf305f16eba353be/vimotizagelenegafiwapidox.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/zisilikuwatidelubopete.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/sugadarab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=120+days+of+sodom+pdf+free+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F19 10868 bytes
SHA-256: 131c0df8dce8580f31f048672e07cfbb960b1022cdf9ffd3ede928e0ea87b6c9
font_01_sfnt_off00018854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A066 18800 bytes
SHA-256: 6e1c1b027d629eaa6624140c25c9ed915bd176eb4897111a9802a49144a0a9ee

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