Malicious PDF — malware analysis report

Static analysis result for SHA-256 7679062a24fff820…

MALICIOUS

PDF

82.9 KB Created: 2021-06-27 14:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ceef80add5cfe44090f17f73ff78a7da SHA-1: 03f09af57052c6660a01bf3e430288a6014e9f63 SHA-256: 7679062a24fff820732eaf578264b4278dd4b07add54eb1640b5ed71540583ef
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links to compromised CMS upload directories reinforces the nature of this document as a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://yilip.net/userData/board/file/82370223609.pdf
    • http://zaun-produzent.de/userfiles/file/denumutalafib.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08bf78118c---nutaboveke.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/dc37c37cbe0c078a02b3a671f946a145/wegujaw.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/87f56ad3d1dab3929cedc85e82676007/29545092336.pdf
    • https://mamo-tato.ro/userfiles/file/gikosobotar.pdf
    • http://footstepfloor.com/upfiles/files/fipilameparut.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/lrmd5dhotfrtpl2cv1r7rm2747/42367543811.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/12386475229.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/58ba9a67753a0e9671a5bdbe67656b33/28766242421.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/21vqae9glcmu6n475on159i7kb/nigexejojofatesakesuke.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/63212524823.pdf
    • https://larustt.com/upload/ckfinder/files/samarimakifa.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/7858ff01f366a3cff3d026ec90438d27/52104624492.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/xolipil.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5181dc19c1de56f3db85d9faae70677b/tigojufuferikibubuwaj.pdf
    • http://csptech.net/admin/userfiles/file/18668927803.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105101159168185.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/vk5rg4ul40rcpji4mdlcnb2gbs/84211850947.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/22485979989.pdf
    • https://nnkcreations.com/userfiles/file/poxasax.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abf20c960a4---80351329401.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=find+missing+variables+triangle+calculator
    • 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_off0000df74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 16792 bytes
font_01_sfnt_off0000f786.bin
ac5d87f032bd7c66e9a08a3177212951ee5148ff24212234816162983d239288
pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 17204 bytes
font_02_sfnt_off000124cf.bin
ec087a5326ad02cae293956b771b184abbf5ea1665e7825a7d540adba02de693
pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 10996 bytes