Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f3c37c2c8d816c…

MALICIOUS

PDF

70.9 KB Created: 2021-05-28 23:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9a24a97123febc147d64818b286505b SHA-1: 188c928b2126f638d0fa97362c41ef513f99a4ca SHA-256: 44f3c37c2c8d816cbd6e3bbc991994845a2b8b15d3c8a394ad16ebb6916cbf0c
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The document body is heavily obfuscated and appears to contain junk data, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8212

Heuristics 5

  • 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.
  • 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 https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/d75a77ddb6c27f711653bae4d1c2abb2/41893017042.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/f000a2eeba82ea67fc0e57b51c601040/19547683982.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f86324cbcd---putono.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073089152494---xisidagasepiti.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a189cf148---42472991445.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e54bb6a10f6defce769ff100df43cd40/55251039227.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/70fa92f39337f3f05b0afb0f5a729fd2/77700391695.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac1ea9603---53031435476.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a63a4faff59---mujonodopexewurun.pdf
    • http://domeinbeverdonk.be/assets/files/file/87723211181.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925202d4df6---16871276379.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/bb5e6d0997dc8abf373ba17d3b11cfd3/pinaxopavipiruzinefewum.pdf
    • https://prosperitas.be/data/assets/file/xuxez.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608804e600570---javewemafo.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ffb006349---50453692019.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/c9lou26lobk5q8vassjtvjishc/fenojegukobipot.pdf
    • http://aldara-latinoamerica.com/userfiles/file/gowimiv.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/050d84e5b8e252570e5f9a3bfb0f4a82/moruluderovufowawos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+th13+clash+of+clans+base

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfe1.bin
bba5bcdf3026980c2b82fdab61f7336fdd06476048ca0e8b8f04d8a6b1186b83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE1 19944 bytes

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