Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fca72de00a1a1d0…

MALICIOUS

PDF

89.3 KB Created: 2021-07-16 00:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf8c4a64cc70ac915e72acd9ab456565 SHA-1: 1566bb113bef45260ff66ec40fd2a7101ec4fb38 SHA-256: 1fca72de00a1a1d011f1ecc849c6b4e8d1c6cf2e20684fa2f10f3ca62c228fe6
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely serve to redirect users to phishing sites or download further malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d244a67e---baluxosatinojo.pdf In PDF document text
    • http://www.annaleehuber.com/content_files/file/gurupikimuripizez.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/tulatopukake.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210627042041993.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/23267293339.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/3kno3ui1lqq8617hmrbnq8kgu7/levaviso.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db98817f1ad---zakor.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa584b3a51---8811601531.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d74abf5e74612b4b48f4e15a2acc4dda/manawirefeligepap.pdfIn PDF document text
    • https://mfdesign.hu/files/file/jasoki.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/bacfe9b954d894940e3db2cf5753e05c/korevamitubowuga.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/72694142063.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/ruxosowufuguwifeba.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/vafefapa.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1623925549987653841.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ald3ssggfvrpca10fliamdn9l7/41004690915.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/73a84cf2716a9c5b0e2dea4b9b5d5ce2/31918181088.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/6426342813.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/83998074040.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870eafec6ac---basofifabomedobega.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8aeb67050---32201355875.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/20251768233.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077fb40773f1---taremexilov.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/dawibomezawusuni.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/83de3d65c871aaa0e0270b85c3a226a6/sajef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cold+storage+project+report+pdfPDF 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_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 10760 bytes
SHA-256: a6e5fbb1e9f27af78fbca58c6c89ab5da47116cf06de3491bb0a2b629f6e4f95
font_01_sfnt_off0001122c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122C 17344 bytes
SHA-256: 6a5ac1ed1c8c083f927cbf283fa10204ec8e61e23c08b71e50d0a1da1fde8627
font_02_sfnt_off00013fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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