Malicious PDF — malware analysis report

Static analysis result for SHA-256 3693d007e64fd2c2…

MALICIOUS

PDF

93.2 KB Created: 2021-08-07 19:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91bd412e4dc2f5766fe2275c62e282c5 SHA-1: abc6f8dfac6a08dce601d24438acd7ae563bf6f9 SHA-256: 3693d007e64fd2c268dca91f2c5a580600965aaf18b6717c4d1d5327d9355efa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which point to compromised WordPress upload directories, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://pixomot.ru/uplcv?utm_term=have+yourself+a+merry+little+christmas+original+singer PDF link annotation
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16078b3eae8ae7---92913084013.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/19802649359.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a29cd0969fb---22458202271.pdfIn PDF document text
    • https://synersys.fr/contenu/file/93809704537.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/93057452890.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/18303501846.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/t5mn1m31243r14a4gd2d2i30de/mibabizutamim.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/17719509539.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4c1f733f2---xososeda.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/19722806795.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/ralixa.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/0l9uds09mj41jagg0nq5v1q9ge/kafabonuxepevib.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210719_3D62A2AE164979B5.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bevawe.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/6123032475.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a685465cd---gobox.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/23805117416.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210603_C3DD94FB978C94CE.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b842706cce2---wazabotifopofonavos.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/64011849174.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/59460388302.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/20c0b711808678bca8fc17cf36a0e25c/98816618350.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/34411916402.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/vozejalasenonox.pdfIn 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://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_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 19852 bytes
SHA-256: 901a6b95327690c00c0ca23c099d0177a8f35b6426c0d7ceb77df1f6880cd3e1
font_01_sfnt_off000133f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0C 11056 bytes
SHA-256: 3b3e65204107aa682af49ca4227cb6d91a851c472bb57c7dfbb4255bb9da8367

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