Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75313836a595f26…

MALICIOUS

PDF

85.0 KB Created: 2021-09-03 10:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33f6146af8e1fe3b77cfc8aec4fc3b2f SHA-1: 93fbd752b6da69bf6c03b262682b15e41e763020 SHA-256: f75313836a595f260a9b6cac806229a6d01b620688efeb8120ad6fe8ecf4fc26
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads, exploiting users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/73d8b06a857b0fe310ca0e5eb30c4725/82070876577.pdf In PDF document text
    • http://abarappresentanze.it/userfiles/files/dudixopuzusetekoxamexez.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1cb89405---sejujekedaziwawomawurij.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/37152479700.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/28065641702.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/it7ju6i3kvu1083s41iu2gcst1/zamagunuwoxisimugokizum.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/zesurojufasapuguxavuneru.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/47923730634.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4161e0877---83462542713.pdfIn PDF document text
    • http://zerosquareonline.com/file/pamadafirad.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gpveg21anl62p3fisiq0i182qq/wofegakegatal.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/bf7309c7e2386cb4f56b5a744fba23b3/jomixigogipovakux.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/evql432d71u7f5jibsdjt3gp71/94871942485.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e1e7bbc4f---ganuzogoxozewugekuvitiw.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/76766f0bafb594bd0dc48be91482ce4b/munopetewikibosodilemaz.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e24cdb5f0a0---muneputoxiromo.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/zesadojufirazuk.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ff70aed3---11815419428.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/b53452c02a7d134363a9c105b6e5d4e9/32992735887.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/kimojuzusali.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/finudiguvunuziwi.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/70770073400.pdfIn PDF document text
    • https://scriptdd.com/_file/file/soxemavutuxatakuf.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/bb571310583e87c0773b8949f90129a8/41092284237.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/jufinixenolugofeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=4+kompetensi+guru+dan+contohnya+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/vazulufopaweb.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 11308 bytes
SHA-256: 4817704913bb648dafe4e9045dcf7368ea8b910e045673ccd2bdfb0445bba968
font_02_sfnt_off000115cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CF 19172 bytes
SHA-256: 93063265fdde2ee3d5df07f93711e5ba43769c5c1e66a84c2832695c1c5db245