Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cea2f8e584f28e8…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 18:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 65ab5000832da0b3e5922a8110e4db6c SHA-1: ebdf289764e4950d9cc1bb4e44519b7716cf0f44 SHA-256: 4cea2f8e584f28e8019e98d0046bbbd0b77c127dd92ee76a7c5530bedd43efba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using deceptive documents to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://weddingdiy.cc/uploadfiles/files/20210630_202030_4868.pdf In PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jumumelilaluxudazesu.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/14028211035.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/navupubetesaxujelisiguzov.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/ruwuzivomabajuxobe.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/46070538849.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/74312739327.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/91820614418.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/asdsq6e3d0v91isa0lssv5k2k5/wifuxipoxupijagelukur.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/jiragezut.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/lazala.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/torapuvojarovo.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/femixoxuxotipupukubogeb.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f858dbae8---zukapatogexofojav.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/67363980784.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/35303838661.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/tatamenorudenebumajomex.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5cfada73---telejavolozegopodumu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8dcb0174c---fevigogara.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/34654904602.pdfIn PDF document text
    • https://digireg.org/upload/15863061044.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/64323840321.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/guvopikofemuwisi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/72413986320.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/82896231694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=canon+ir+adv+8105+service+manualPDF 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_off0000d32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32C 16640 bytes
SHA-256: bf0e6c2e32c22d83393042649eedc6ffb59f6d7d01a763ab62ae0dd0e99842a0
font_01_sfnt_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 11148 bytes
SHA-256: 3ac00a573ae2e0bbdbaab9a54ab250df1e7410dbdc43e63516d89eafe2f1363f
font_02_sfnt_off00011816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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