Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d10ff39e6927660…

MALICIOUS

PDF

73.3 KB Created: 2021-05-15 09:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39c6a1546355428ea0362ce61748943a SHA-1: 7335a4793f506fd6fc3c5717bdd7c1e1799467d4 SHA-256: 7d10ff39e6927660c8285ddb6c1789da8d94b890254e2310ac25e24be7518a1d
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload directories, suggesting it's designed to lure users to external sites. The presence of numerous links on disposable hosting further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8212

Heuristics 5

  • 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
  • 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://mobydick-band.de/fckdata/file/jerebewojamanerag.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715221bb794---7847411420.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9cba6e642594c4f79044fa1c33d60dbd/livivutoxupadap.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/81015f1888c1ff9a04d7f033a9a07df1/pisanejupe.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/a603534251fb8e2a145a1bd25adaf2c7/11242123713.pdf
    • http://brmxn.com/userfiles/file/20210515061323_nx7hir.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af2701f4ba---dateditiminenefuw.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce6f3abb8e---mirerafox.pdf
    • https://chp-travel.ir/data/file/68446777007.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b969e76a39---mawazon.pdf
    • https://acgroupenterprise.com/userfiles/file/pawef.pdf
    • http://alkanboya.com/files/file/%5C/24091267261.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813fb2c303c---44622311792.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/8cd43f749bada775c7c146f842ba494e/60983920565.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=black+widow+song++pagalworld
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f58c.bin
7a47f8e449675d0dfbd579b784ca6fe504c839f7576f56f4c6bf55f6a9e20edb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 5448 bytes

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