Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ac7e59be1d5331…

MALICIOUS

PDF

90.3 KB Created: 2021-10-08 03:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dbca9a77eea89790aefa16b26ffc90da SHA-1: 517b3ee094c1198ee7ff06b14d116735683dadf7 SHA-256: c3ac7e59be1d533147e000289279140359f58b48b3196e194d84d6b34a8d26fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://coretry.ru/uplcv?utm_term=small+boobs+without+bra PDF link annotation
    • http://bociany.sk/media/file/84371964978.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/14182437524.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/danekarumatejelufisarezuv.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/64839253768.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/4087c278f9817008cb9c447c6ddc43fa/zexekexetetaf.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3f4796d21---8652604333.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d1d71d9d0d---29372635801.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109051357051449.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/terowilurawugagelo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613f838714246---linofixa.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f0a5f53a76b36d6a1833fcbb6a184fad/17375018392.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/fewonemizezenitokesazonub.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/36472646787.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/fefafonalijomipamalirakov.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/wukimeviko.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/40652186281.pdfIn PDF document text
    • http://poliinc.com/upload/files/vobiwol.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/37647878303.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/nomudexare.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109082104011322.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b9fa58266---fazesujinidusawu.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/wejemu.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/davopatazoxuziko.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_off0000f8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D4 10536 bytes
SHA-256: bf186293587b123e27c14540628e4ac0a2deb27bc4d13a1b73784b11524534c4
font_02_sfnt_off000128d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D8 19484 bytes
SHA-256: cc56b82b1c5207600147befff4314f537f486bfb81db34d1851fd0d57d7a2278

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