Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a19931b0dd198b9…

MALICIOUS

PDF

98.5 KB Created: 2021-09-05 15:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 31adbf0c31b6e6cdc254d10cc1b5f415 SHA-1: 1d35a1ed7a9e798657f698352c39fd42613d0afb SHA-256: 3a19931b0dd198b9d842c27870fe45ece3490ebca54f1e7ac3649333fb39046f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://lhdrum.com/User_File/UpFile/file/20210824185435_bmFuYXNlcGltZXd1ZGVub2t1.pdf In PDF document text
    • http://linkingpeople.info/userfiles/file/pepifiminelunaravutosofi.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/pezovi.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/46076996959.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/68640172922.pdfIn PDF document text
    • http://cold.lt/userfiles/file/saxulazilejikegos.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/20937855835.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/34930173936.pdfIn PDF document text
    • http://tercovci.cz/files/file/suxekizap.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66087435a8---doragagasozusasizevesi.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/33978515888.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/putevetanezilakivivaz.pdfIn PDF document text
    • http://staropolski.net/Upload/file/58270068395.pdfIn PDF document text
    • https://kede.org/userfiles/file/41728824607.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/niwazalixaxetitag.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f0ebf1103---xilijigegepulisajimebumav.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a05a14d7e19c6cee4313cbd4fd28bc44/nokeponogawebonibuku.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5ab068696---2465142339.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3f19292c2---manujigojumuburakekomod.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/joximokurezomezapa.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/dolibiminakowizif.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab0e206fb---20118583753.pdfIn PDF document text
    • http://modern-pro.ru/files/file/mazidesobunigavav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=customer+segmentation+mckinsey+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACD 18172 bytes
SHA-256: d187d6ad3d834f137de07edf26ef3f4fdd63f78ea34b453ca8c51bd9bc05c653
font_01_sfnt_off000149fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FC 11256 bytes
SHA-256: 73b2189b7e9998f58825041051608cdb16265f9a9ae118af8444ccf213372771
font_02_sfnt_off0001644c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1644C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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