Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae57955186c432a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 14:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea79a6addb6b3db54243a3704586fc11 SHA-1: 507e35d061363cb17e0642c6f6e500c644aeab8f SHA-256: 0ae57955186c432a0cad47efa7686079dbb46ebdb868f9700cb13e1bffbf917b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of links, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://henanshuangxin.com/d/files/21659371199.pdf In PDF document text
    • http://com123.vn/uploads/file/35422296324.pdfIn PDF document text
    • http://willbramephotography.com/87882935351.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/30552757310.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/15901cf35f92631e9b3a2852fc6b3be1/kuxeburofomesi.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/43914a762e890130b1629baf0dd12ab4/38736475159.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/47170997334.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c442893a0e---nogegunowekuwiruvufakaxiv.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/givugiwog.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/67640206154.pdfIn PDF document text
    • http://air-ned.com/uploads/files/72298809443.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/85881616210.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/079410dfd48b1d879297702aae184d2b/nuxekupelo.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/32183483226.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/87512800551.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f483b7b916---jevirasupir.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/birijatu.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/nudolasu.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a6053447221cd1514b5f9fa4e68e23fd/zigotebumav.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612c55884ad0b---wixavijejetatinifotun.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/90d0642eb71c50198e642d45b2f79816/71615919765.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/16016176666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ducting+material+pdfPDF link annotation
    • 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_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 10776 bytes
SHA-256: 576241f0f59b02754833e5758be9c69161bff1f6dd169f6fca39210df1f086d4
font_01_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 17064 bytes
SHA-256: 1390f6cad5d37eacae642e060f93c2bcc3542da587e23202bca45ff5f7c3027e

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