Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2869122e7ac980…

MALICIOUS

PDF

85.7 KB Created: 2021-09-23 07:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41408619d86150c1b9aa866b99858494 SHA-1: eabae9fd70aa3cccc78faa0414c89c0848f1f728 SHA-256: df2869122e7ac9801d44cf3bccd9b7a6dda541994e3658248f4a08d3c4a1a830
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://allytemp.ru/uplcv?utm_term=unibet+app+for+android
    • http://teleinwestor.pl/userfiles/file/16733466509.pdf
    • https://yarpaket.ru/userfiles/file/bobipiwexusixowek.pdf
    • http://imobilestore.de/userfiles/file/13127630082.pdf
    • http://canavesiobruno-architetti.it/userfiles/files/63877246409.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a3dd61269---babovuf.pdf
    • http://cachnhietcacham.vn/Images_upload/files/18776059184.pdf
    • https://gregoryshow.ru/files/file/ruzotavux.pdf
    • http://adbuilder.at/ckfinder/userfiles/files/60073140423.pdf
    • https://booburger.myagenda.cz/pictures/editor/files/bexopen.pdf
    • https://calienglish.com/ckfinder/images_store/files/61656921115.pdf
    • http://fruitvita.com/files/files/nurogulebuzaw.pdf
    • http://shangyi-pump.com/uploads/file/221827315102.pdf
    • https://jamuiboe.com/webroot/upload_media/momodepixakuvewudi.pdf
    • http://grimastone.ru/files/29494768617.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/jizuzokirabig.pdf
    • http://sovaimm.it/userfiles/files/ximitixumera.pdf
    • http://showdoimovel.com/files/files/tepedu.pdf
    • http://mutamobilya.com/images_upload/files/fibirikixet.pdf
    • http://ttmplus.com/userfiles/files/devowulatunop.pdf
    • http://hodoan.net/userfiles/file/zapekinetasibiperopo.pdf
    • https://kingdomofgodmn.org/userfiles/files/39882096039.pdf
    • http://ceresasrl.it/userfiles/files/2633434132.pdf
    • https://rosenstein.lu/userfiles/files/92379706185.pdf
    • http://zonazero.es/userfiles/file/12403225647.pdf
    • https://bbu.vn/Images_upload/files/fofafepewexak.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/lldmknocbkagt55uprj24436t7/35346628497.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161396b04677db---bijogesabisasomisati.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/xorusajitazugeworuwe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 16792 bytes
font_01_sfnt_off00010257.bin
94a11242baab2142cba63ecf42b75eb765619a47f63f7f665c476d212afb5dcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 10424 bytes
font_02_sfnt_off000119d5.bin
3bb2c4b89d9bcd35a943ab97fd6696e998ddfa69f531b5d092ae093ba5e1b0fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 18140 bytes