Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8be4cfbb2a6ab09…

MALICIOUS

PDF

73.8 KB Created: 2021-06-06 11:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f4d018ab5bde626c085058f41e9c7920 SHA-1: 00afbde907b39061b51ba6da3d951a3c987c971b SHA-256: e8be4cfbb2a6ab092796b9e419d3a29bb3724b9d2469d2cd2df9def945a3922c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to compromised WordPress sites that host further malicious PDF files, disguised as software downloads like Adobe Photoshop serial keys. The embedded URLs and the structure of the PDF suggest an attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/uplcv?utm_term=adobe+photoshop+cs5+serial+key+master+collection PDF link annotation
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/c281d6f4e0efb31cf8194f0597ba3a1a/lidavalomikeriw.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bac4cd0b915---nuziku.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6fec345ad---gurodu.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/vetadufenoliwege.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908cc8442da---jiwemo.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/56377693146.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/ruxafarutinofutuvul.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c4e0c53c8---80305509035.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/18489758076.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5268906910---86693436195.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c817473537---wusedajuxizizafejit.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/luwotosovolenorajivefad.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/71996546727.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080fd05f01a9---ligedasaz.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/womapizamogadekisazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 5732 bytes
SHA-256: e4f60d4d141f8612040a27958a35c83839a2aba964afe13374f43e451c459f12
font_01_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 10332 bytes
SHA-256: 0d7ac2238ec445ee6c7d6c7d6cab8712c6e9572b0b6c84bf9b11b379f8b4be5f

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