Malicious PDF — malware analysis report

Static analysis result for SHA-256 128ba00fb2e20125…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 16:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 418f4d32b166292ffb2d1c9a9cf73e89 SHA-1: a2fa57bf22e64dab6585e6d4862e204ac3234e3a SHA-256: 128ba00fb2e20125133db350e9b9e655d492e067df6ae9551ec82765ad2b875c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=all+robux+codes PDF link annotation
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec600cd961---87640813920.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/26gtvtp9obqgq88u13ttg7ea8q/fumuzagekit.pdfIn PDF document text
    • https://sainaudit.mn/File/bemakejex.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/28003296356.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/kidodanaletevuxunebamen.pdfIn PDF document text
    • http://jadeite.ru/images/file/98089162057.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320020397eb---ruzepeliwurebijilunezi.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/sumufoledoparakeni.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/9509972250.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/32069485157.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/bagijizopatisomenoruwiwif.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d1ae1b64---55263190463.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/baguf.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/i1o639g3lqflvn4csus6rlgsb4/lifonogavumodifolodaz.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/livasad.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/53a7525860e9f222b004dbe07a444f37/serixadodenef.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/kenujanuzekozilerofenug.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/39macnl743kldql1e5b35e17kv/45367151692.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/livujotoxipeve.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/92468836405.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/48817108371.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/24365684688.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/60469126250.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161401e8c4823b---60953411312.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_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 10228 bytes
SHA-256: ff74bc2d6a83ba6d58ee1f3f37514a06cdbc9bb8f8c5cff0f724d7dcad730b21
font_02_sfnt_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 18144 bytes
SHA-256: 7d82990b90f89ffbde1abb895ea3c9eb39eedde9fe0334cedb4242dbe6d331a3

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