Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c0200edd12b55c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 02:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ced8be102888c07303e649cd4a7a469 SHA-1: 0a5790421d59de92eee932069c06c1725a1c324e SHA-256: c6c0200edd12b55c66b4d28aa9e92dd7e1b5f718324c5a4f3312985f032a8753
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its malicious intent rather than convey information.

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 http://pescepiana.eu/userfiles/files/25399774782.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613e17168e222---lulivatafuriveb.pdfIn PDF document text
    • http://servmed.net/userfiles/file/peretezovib.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137fca3483bf---6683437037.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351ebd7fca8---rasewowam.pdfIn PDF document text
    • https://comfort8889.com/upload/files/tigisulalovatutar.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/14477932274.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65639409350.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/jowalesitoz.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5a67ed4af627707ff4f1cf223e0f35c1/5697142849.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/2979350318.pdfIn PDF document text
    • http://strandedtattoo.info/file/46868949605.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/74479251164.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/milusa.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630804438.pdfIn PDF document text
    • http://gibisch.org/files/files/vufasufa.pdfIn PDF document text
    • http://mylodge-naoshima.com/fimupa.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/90032508827.pdfIn PDF document text
    • http://cpviettin.com/upload/files/50193678481.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/72887023319.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/12964065460.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/fulobetelazuvon.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/tolitid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=genki+i+an+integrated+course+in+elementary+japanese+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_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 17884 bytes
SHA-256: 6328328078875c3e8c469972e03852af1c438514aeac683959aa78e54c110b25
font_01_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 11440 bytes
SHA-256: 254be837231afc3dae8cae085e1b6ff773de1a036c8502cc1aea35fd08a15e98
font_02_sfnt_off00012284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1