Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca6f1c26657db99…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 00:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3301911a4fe199054c7e576dd006af69 SHA-1: 71115c02a53b3010e1fb1777542a0eb7ea233ef0 SHA-256: cca6f1c26657db99843f5a40e0b13a717e7080f84502549ebffb35e98f70726a
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://antonio-pelella.eu/userfiles/files/milem.pdf In PDF document text
    • https://carlojans.com/cms/file/foxugesamatuxejeponuvedo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140f15b2fc2a---53535269266.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/mimifamativ.pdfIn PDF document text
    • https://csn-alliance.com/data/files/98924164886.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/8177eb56a87d7866891948dba3ee9210/vovomowan.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/98354496142.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d7eb495c---vogirulimobusipiwovoni.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/kizokakowizal.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/zumuxevul.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/muxedowoted.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1994de69ee668873c5c3a28c92ff0b2e/7422405505.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d6e50766a---mobolemok.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219171557541268.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/tefaxiri.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/69323442263.pdfIn PDF document text
    • http://vln.nl/files/file/18440129945.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091513422884.pdfIn PDF document text
    • http://gynekolog-zilina.sk/uploads/fck/file/86368580521.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/56026197512.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/79250261982.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/guviritupevo.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/84632314526.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613043106e06d---sofiwirawejonepobumebu.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/61755708875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=top+10+hd+wallpaperPDF 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_off0000b654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB654 16936 bytes
SHA-256: 494b03129d08966a9c2628782b0aa9f99ca002c45fcb94a23505fe9d2e3d3ac5
font_01_sfnt_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 10252 bytes
SHA-256: dcbd5ee2079c2df45e5e01a97329c9ca16403bd52d57bfd479306ae8e2eb740b