Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf1d814f44af692…

MALICIOUS

PDF

91.2 KB Created: 2021-07-03 16:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d704d1fcce0217c8457ca2cdcdf96fd SHA-1: f25de7800e51da81bbeb26a4412683bdb767c129 SHA-256: adf1d814f44af692cd2bfeec97d92cb8f7301aa682a5be8a44959c8ab8288381
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the presence of multiple external URIs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=acquainted+with+the+night+analysis+line+by+line
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8ad0bfa41---sepozika.pdf
    • https://eminencesolutions.in/resources/userfiles/file/64900444668.pdf
    • https://allcreaturesinc.com/files/files/xovewaximagedefofodunaf.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609a017b8f7e1---dawubagijokibisiramimipe.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/deb11c3ca2410981aa701952de274592/vidoguruzijukalubo.pdf
    • https://davidfoleyinc.com/userfiles/file/lavide.pdf
    • https://bamfieldrental.com/userfiles/file/tefil.pdf
    • https://mfdesign.hu/files/file/vamifejirewawuno.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/51dbc8c4e63f1719fd3778e7e21c2ac6/89017967786.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/64408836466.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a35d51cddb5---2944865327.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1hihepm2busfan63vlstuqrul5/53960517687.pdf
    • http://ssaisarang.com/ckfinder/userfiles/files/22428600819.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/9d95e40dbc7bf8d4bd45f23adadcad07/93240031329.pdf
    • http://budaikepkeret.hu/uploads/file/42198914876.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60388554475.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/fb5af7199cf21e624243d8e5e8cb0ea4/ruzawepex.pdf
    • http://staceyasp.com/UserFiles/file/2955731825.pdf
    • http://waberry1969.com/clients/877040/File/mokax.pdf
    • https://thefertilizergranulator.com/d/files/67892426670.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/115f5cfaa28e0988ffc282a2837fe41f/6421804306.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a947d54298---47025715239.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101a6.bin
6d7d408b3d88ad7ca0294a0120088068c381d5b8bc775acbbfe9df02b4de159d
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 10996 bytes
font_01_sfnt_off00011ab6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 16792 bytes
font_02_sfnt_off000132c8.bin
72ce3f16e7fb6e6a9a997a8af750d84ed45d553b7aeadf285b3d2f702c1773e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x132C8 17368 bytes