Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c498f60cd7a5093…

MALICIOUS

PDF

92.6 KB Created: 2021-09-04 20:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: acb0f73ca9660c0423c82723bc19b05a SHA-1: 4bc938909f78a8597b8572b54d326fd150c33e6e SHA-256: 3c498f60cd7a509304d1d0f0c67e21e8b8c44b0d526f484e8382589d60dc2a28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript, though not directly analyzed for malicious intent, suggests the potential for further exploitation. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sakesushimn.com/userfiles/files/mikalazijejabelotewix.pdf In PDF document text
    • http://zuche0551.com/upload/file/vafagiwekesonop.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/68841956548.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/73162185451.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/93546690768.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e76d45d227---56985447384.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a63e0f681a0---robegibasiledufawod.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/badigapab.pdfIn PDF document text
    • http://standdominica.org/files/files/suvigamebapokabozopabeb.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/moregesa.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/33495485714.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/q1qt7pnljurhqsc4smrj18hbr4/14036838630.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/rimosefarivix.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/1589079166.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a510e016f9e---ruzoz.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/45113708785.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/xazone.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e802e3f50---45056850618.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/5626859332.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/94624747774.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/kilabem.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf48e797e1---dawuzabolutotil.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/95289785988.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2422b837c---zasovujaxoxivipuxavo.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e4c000ac9---xodigamizinoxoxepotevexu.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/60332040878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=single+phase+and+three+phase+transformers+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_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001192c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192C 11020 bytes
SHA-256: 5fdd0943a6c8cb522da8205e75f27a6f5fabf931502ea6ea0969ba4eda08740b
font_02_sfnt_off00013254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13254 18980 bytes
SHA-256: 765fa5d91a966e9d830882515ce9ff06e0e953e3815d9c7a2bd978a02c391b7c

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