Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0dafbd075397b0…

MALICIOUS

PDF

75.6 KB Created: 2021-09-21 16:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40b61324abf4622cdad1bd0fec7332ee SHA-1: 2a7e1ff85f83e874e7774119d17494679aa28536 SHA-256: cd0dafbd075397b0dce584540fff87fb935f75b5b2ac8736f245137073fdebe1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://irlanc.ru/uplcv?utm_term=portal+2+cheat+commands PDF link annotation
    • https://ctcitsupport.com/media/files/vetapalafagizorazeb.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/10687578393.pdfIn PDF document text
    • http://samtekelektrik.com/files/balek.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/meliwuzibirewiba.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///poxugesujavuf.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/kefexe.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/78752477635.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/tefewu.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/50266501510.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/dibajimadad.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/dipisof.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/xelolabojodovizowepilup.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/zowonebaj.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/62602196817.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210916170044.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/88924473288.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8d9e36e2---leseporowenato.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16138d8958c631---baxezemafagepotoxoma.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/nclg1074gkqqs8c9j5e01a8ifn/69144633367.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/72819769449.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/kegixulupif.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/13718702312.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/mokezumo.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_off0000c0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F8 17776 bytes
SHA-256: 17018d6250529f1b3ef33f68d23dd42994d0798387f6380a647b9329ad660ca5
font_01_sfnt_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10773 10664 bytes
SHA-256: fe43fb201584d59ee3b16b74b44c2ec397da5950f1f82ba8afac75337b4b8e49