Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6fda72b1165468…

MALICIOUS

PDF

84.8 KB Created: 2021-06-25 14:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bed9fa9838483c82872d23b29818b6d SHA-1: fc661ca09273cee15e9d10a27420d63419ab08ab SHA-256: 3f6fda72b11654681e30eda6eec7cf97f34f0f233c9b7ff09c8e9fc81fc4fc75
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised CMS upload directories. This suggests an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://familycrawford.com/clients/3/31/31f1fdc6e90c562b7578e9c437f7c1bf/File/13446276105.pdf
    • https://bandotrading.com/uploads/file/18705027667.pdf
    • https://acgroupenterprise.com/userfiles/file/30223547202.pdf
    • https://defrokatilai.lt/images/files/bamun.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a198866558a---59745070506.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7ead1e03---53438367171.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b72085bbb504d57cf77ab43a222d6804/32865018999.pdf
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/povinidibitafenutugupip.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ba92b90d---94749699025.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f6a434456139e324709c28370416e122/89421768610.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08b81d686---gokogiterofowupar.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/glubijgnhk84jqa7sptogevlen/josedumosoxolunisifubebuj.pdf
    • https://cremyco.com/app/webroot/docs/file/dunegogafikavukoxegomuz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=robyns+tack+room
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/908c391407d6b3d3c6ed3c0b50fc53b2/57623887855.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d47c.bin
68a9888b0dea0e3fbe5a1e2ff3bd95ae5340d70ba640131b1b1bd8ac6aec5c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD47C 10512 bytes
font_01_sfnt_off0000ec82.bin
5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 16344 bytes
font_02_sfnt_off00010277.bin
5bc95030cdc522e4289d613864585a601d81d35d51985dcbf980687ce29f1753		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 16992 bytes
font_03_sfnt_off00012e6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6B 16792 bytes

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