Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe333257ba5372c3…

MALICIOUS

PDF

83.1 KB Created: 2021-07-23 01:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89b113fc83cb21129211660accdca2cf SHA-1: 7fac52db8bee4d0de3c648949229ad2d2ae26382 SHA-256: fe333257ba5372c333ab7f8c46c0f4f7070875faa8e3d7fcf2d223ff8b9fa16a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boguvinimoz.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/24f77ed71ea25f8fe0dc4d944d57042e/17355717305.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a19683825---wuvizigejosok.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e567d3fa---69421209792.pdf
    • http://tanphatinst.com/vietkiendo/upload/file/32413526453.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75a274367a---99874355975.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/e360b7fa884337f538de44631ea858b8/91390285179.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5d2v9hvdqa9d3sbu8423ip3777/ruwelugevawuseximojanopax.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16082856227b58---20998273063.pdf
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/gosesemofa.pdf
    • https://bonekarusa.com/contents//files/97425642110.pdf
    • http://zhengfutz.com/v15/Upload/file/20216281057273899.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/837722becdc17df8ffa018d556dcb220/77843702567.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6c5667ed3---rutodozinojisikojol.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d08657e6b9c---nopikezaledijadun.pdf
    • https://birsamundapark.in/userfiles/files/82832927159.pdf
    • https://betalinktech.com/blmedia/file/monadavepabuguzuziwoliguj.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9944697e3492a20b0564ad9e382a08c2/rumabitew.pdf
    • https://rajakeempat.com/contents//files/76879721698.pdf
    • https://daulte.ch/ckfinder/userfiles/files/22034673604.pdf
    • http://jakpaisanestate.com/images/upload/files/23724840114.pdf
    • http://penzionklara.cz/userfiles/file/70240362657.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/22044377802.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=all+in+one+social+science+class+9+solutions
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/fd125ccf819e99565c87fb346cfeed40/lubuxuwupegukasig.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_off0000d8e5.bin
f486a9e5151add8a621ebf45a8fe361c3e5af665663b9e300f35aa7d6de72f63
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 17016 bytes
font_01_sfnt_off000104d2.bin
e8348627cebee13fb696c27f3ca9fc25c92718e0243f1fa20ee1ca5a7bbc164c
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 10372 bytes
font_02_sfnt_off00011c7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 16792 bytes
font_03_sfnt_off00013488.bin
ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13488 1820 bytes