Malicious PDF — malware analysis report

Static analysis result for SHA-256 9659571884bd6f90…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 18:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d719ba2541566f9f2a97135209db8206 SHA-1: 27d89e5e4722466142fa3acc8d4f98131e70f0fd SHA-256: 9659571884bd6f90936ea2284e09b6ad811b00f356cce5f62db080e3d3813fc3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to compromised websites and disposable domains, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of these links suggests an attempt to exploit users through deceptive content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://chcial.ru/uplcv?utm_term=brownie+making+friends+badge+requirements+pdf PDF link annotation
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d7669876b7ae0c98d8b9ec361c914d81/toruzupanewunudodo.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/3851315653.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/o055uhksti4bdvaeql8vu0t9b5/73973147358.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/dee00e0c58da1327dfc8ec14b37a5729/12637748805.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/3b5c58e1e05f088d7c1e76d122d4f629/rinotejemisuledupivaxapop.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/suwafajinokanu.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0725/6dbefb0162c8b7e7a99313f2fdcde345.pdfIn PDF document text
    • http://stromzeleny.cz/file/16541229756.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/70498759129.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/wenogapejo.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d0bf3dfd6---jakemarikamejeposesanaf.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/48952739060.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/werotojanevogokoxagusuteb.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/vilawi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160896a8775b2b---nokenozufipipobirok.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb515f162---1691898049.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097821845738---zirobubukinezobikuwitev.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210625214928.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/66528362597.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd2847b14f---38062406247.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/damot.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 11412 bytes
SHA-256: 16fde3a01c3ec181fdd441637da5363b12cfdbced9d4328d3195734a8548066a
font_01_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 17508 bytes
SHA-256: a222c8962da1af3d016182f920acbd83fb424dbce78daa366c9e42e1d8edb72c

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