Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f65b10b2cec8def…

MALICIOUS

PDF

78.0 KB Created: 2021-08-17 14:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 819d14337f87e4b5898cb0f960d75fbf SHA-1: d0794050ba80f9dbc65500965341aa93965ad14c SHA-256: 8f65b10b2cec8def8cf07b1286ef726e85eb1edc16d6a43771759dbd4ae4f027
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs are present, many pointing to PDF files hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The PDF itself contains obfuscated content, likely intended to obscure its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laborke.ru/uplcv?utm_term=let+it+snow+chords+pdf PDF link annotation
    • https://medtek.vn/storage/file/25628473808.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/gewekibokoxetanekeku.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/nalaluduzi.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/1064203253.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/f3jk1jhheqsb2gj31aeg214ua8/togaxugigibuboxekura.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/40822636096.pdfIn PDF document text
    • https://people11people.gr/uploads/File/19615445291.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/27544354194.pdfIn PDF document text
    • http://adveotec.com/img/file/59983067675.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/4lnugj48al7o48tlhvh7n6s6l2/kegetara.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/zotivozozogenem.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3b56d5b9d---nezenavewowarog.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/45066509681.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/8fbad5982af3dae247d2d5f1a82d4ec1/94778694020.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/solubojowozol.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-8-16/20210816083254736264.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/majenudugiziw.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ce1e759c---77036270422.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/tomevosebix.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/d31hs3lsgs1t6ccfq3t86a73gr/kegodabomupidurod.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f45edf18d9---towewobesavaru.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/magewativenewirepun.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/wezulederi.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/52711813081.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_off0000c995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC995 19424 bytes
SHA-256: 3fb1f2317b8c34228a552dc7a826720433ab1725e7857e6d6eb89c2eabb0f035
font_01_sfnt_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 10552 bytes
SHA-256: b3d8d07c03e858d28e80ebe1ec2ac897d7de282ebcc60b31d8971d3600819a7f
font_02_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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