Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1975206f4dcc0f…

MALICIOUS

PDF

67.8 KB Created: 2021-06-16 10:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2f31e0393d248a3e50bdb49c13158f2c SHA-1: 7e0c574970ce47d630a5dfd20b2f4264099a92ed SHA-256: 8a1975206f4dcc0f359e4a9af08fda9de431b0277278a9e92c68660dd040b484
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable domains, suggesting it is part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be junk data, further indicating a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://catamma.ru/uplcv?utm_term=%25C3%25A9valuation+technologie+6%25C3%25A8me+les+familles+de+mat%25C3%25A9riaux PDF link annotation
    • http://retco.ge/ckfinder/userfiles/files/kulawafevezizeruwodumixu.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/karodikofinorom.pdfIn PDF document text
    • http://fygl.net/uploads/file/260722259921.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/m5k3bgpem2hbpfmsoj6a8k0oe3/mefujororojutajeb.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/juxowewulifuxa.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/juxizogutofaluvew.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d941cd5459---74734638374.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f6b8982606c3912561009cdcbfa2b094/8780856563.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5403e71c6---95030354853.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i99fd699ke2sf3ogqd7tjoj672/64735301650.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/8gsup5lnd2ppntldkafietj0aa/zikelujilor.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/zijelabajanupabipuwo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc677bafc40---jitonorixazirukozijof.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b808bfbd6b56f8d6771c44b75a5b5713/74857901109.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_off0000c7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D4 5980 bytes
SHA-256: 8161324ed5fcfb02ceb4270bc1ceba0efdbabb247f9023d0196dde1fed3e90cf
font_01_sfnt_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 11116 bytes
SHA-256: 5cbf1a998ede3036748368b81e5f6efd85b29536c6dbf6b2481e944c6d7b83a5