Malicious PDF — malware analysis report

Static analysis result for SHA-256 9151b784478e7dfa…

MALICIOUS

PDF

96.4 KB Created: 2021-07-22 05:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b59eab1d8578341cad528f1936373682 SHA-1: e47d9f8e5c2193dab04fd7fa57bb06cac8ab8322 SHA-256: 9151b784478e7dfae41eb95de6a6d28ed2c636b53edecf7eb8513386ee9fabb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://dianacb.cz/userfiles/file/wuraxip.pdf In PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a978b637190---23870582656.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083adbea59e6---1024047294.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608827c0e2242---73779716208.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d127bccf3d---xidok.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/37895568170.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd953f4dc---54275998867.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/cdmviu8mpsg3m30kt7cd2gml64/koxogar.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/55458379711.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cec4cb7027---ritarezusabegon.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/20397158709.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fab680c317e9c8983cf92bb19a99b7b8/jopagidiku.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/e32615e994c64b32836db1c1205e1ddf/jamosukijisuxafuxijotab.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/gumogekemakew.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/nesojedimakoso.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/989c967e6e1002b19bcf25d0162a9f8c.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ed6355dd2e7ddebef125ce331a68db5e/wuvejajobudixubemorefute.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/66346969488.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hce5971um8vas96n2bl875r4o5/dokaxoza.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb287e38ea---4565282169.pdfIn PDF document text
    • http://jfe.hk/userfiles/sadevomo.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/zenigutuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=grade+12+advanced+functions+textbook+answersPDF 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_off0001116a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116A 18204 bytes
SHA-256: 60eba6361b7aa672ae116644e56790cae24a1e8705b7c5d1a618360bc2959814
font_01_sfnt_off000140e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F8 11220 bytes
SHA-256: f448ecf5538ea941313ff6eb3ed9c9f12ace3657a3f8f14de2459c129c7d2ab4

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