Malicious PDF — malware analysis report

Static analysis result for SHA-256 346e6693f0f198f5…

MALICIOUS

PDF

92.9 KB Created: 2021-06-25 16:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 805666f1e3cdefad930cd168e8997221 SHA-1: 14a8fe6cef4c34df287cc0cfb6dc7536961bc21e SHA-256: 346e6693f0f198f5ca45c469dccbbc13e0d625c4abc4a4c1b36e4091186381ee
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a link farm or phishing lure. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing to the use of compromised WordPress sites for hosting malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774c327ada1.pdf
    • https://rivaflo-south.in/userfiles/files/tovem.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/3fc4fab7a463ef592841a33556ad3bb5/40156490383.pdf
    • http://adria-ex.com/images/blog//file/50605626158.pdf
    • https://jjcfurnituremaker.com/userfiles/files/fodafijetuxuj.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/39473118312.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/a2l34kmlsr526lhoccsu5q1dpt/62235869473.pdf
    • https://egyptsuntours.com/userfiles/files/88769451156.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a529b5883e---43309342021.pdf
    • http://shqinze.net/admin/upimg/file///87928589270.pdf
    • http://akkoryazilim.com/userfiles/file/66813979934.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33e66517d5---14497995763.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/31b29fcfac0d88e6ffded10e380bd541/94051887676.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/i7rj6vg416op7gqpbgnpnkus5s/29737895194.pdf
    • http://applexin.com/ttpsea/files/file/64723036027.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb4d37ee06---tiwozaxitojegubazeze.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+frog+and+the+nightingale+poem+questions+and+answers
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010742.bin
d889234bf7d57c580e769ea5da0705a965f059d271000e8b2b7924dc07e765c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 16896 bytes
font_01_sfnt_off000132d3.bin
3ec657b3bba2566eaee155c5ca6e7b31b2a39d4db0b94948c779fa380ea36417		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132D3 11240 bytes
font_02_sfnt_off00014c87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C87 16792 bytes

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