Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c2f338c061e3f6…

MALICIOUS

PDF

83.5 KB Created: 2021-08-24 11:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 199751a953600ed247dee453ae0d2647 SHA-1: fe197e39a93c46f57018464afcd9e9ad0949097f SHA-256: 46c2f338c061e3f6e6da2b203958848dbfe53c3fc66eae8bc25c68d164e54872
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. This suggests the PDF is used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://starrsgazette.com/admin/images/file/vufafalajo.pdf In PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609286257b010---zituriterovakijet.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/23583791189.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/34497950453.pdfIn PDF document text
    • http://ggled-smot.com/ckupload/files/kerixunipixedoxebojiwip.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/vajenijaxikuxubikujofi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e36be7dbb---sutifuzukuxujevanavaraxu.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/xaduvokunirur.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/goniwovosetulafomezibefa.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f45224d63---81251651280.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612179fdd08c0---76518145573.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-29-15-29-46-66.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/wereniwogokik.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d1c72cd7---58214215581.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/fulekapevotipuw.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/p10kl4o8kv8epoft8pp1783r2i/79866363079.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4bbbbd743---movanujajepelivarejon.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9de591452---terukagun.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/xepederedazekabobegagabe.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d29e902f9---fotufasi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d234265aa19---vepexofitisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=define+the+sovereignPDF 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_off0000df6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 18496 bytes
SHA-256: ba2ed352a654f181b066a9cb876da4fba51be07b3be9811daae70e19afe2d61f
font_01_sfnt_off00010e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001265f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265F 10352 bytes
SHA-256: 8e678016dfaa785488cdf89e0ac0ff742c3099f6fda0eca2b83fa67678680bc6

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