Malicious PDF — malware analysis report

Static analysis result for SHA-256 011d94d905fa195c…

MALICIOUS

PDF

112.5 KB Created: 2021-07-13 16:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f1544a6465b1e7cc4077ab30c1ee429d SHA-1: 53e481cfa742f824ef3f0931ab2bc1971b0d60dd SHA-256: 011d94d905fa195cb33b58fed11e9b180bb876587b9fa779438ac284583d5598
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link manipulation. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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://bidmitt.com/img/files/file/xawozapogapas.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b8ec7332a---92748318847.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4672035b---kabipunuxopemipuwedanixo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38b48abcc---53675207557.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/fa2466724855939e8afe6a56ae838130/76190066795.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/51915207765.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fr5hu8rfs48f48ld163khnsq60/50787172266.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/xeded.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/lufaxamorozagovazilolokup.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609dafa2d9fcb---33304486331.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc939d98fc---votumeruvas.pdfIn PDF document text
    • https://yellowstonewildlife.com/43115789013.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/28868933484.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/33237516686.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/32677458515.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e1b37bc1---54149738500.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/xavigukunudezavekuro.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c2c486dd---mirujaru.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160793ce99183b---bonuvemewod.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ce3b04900---85242671305.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7c3e81b5a1c25564f8e9a1b237451f07/wasadiminewitazepowi.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/baresez.pdfIn PDF document text
    • https://aromamarketing.md/img/files/wutezizoro.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fe31209a8---bulezoguge.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b74b71465fa5b9e69c7fa804e900837c/97222649254.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/tekilipiva.pdfIn PDF document text
    • http://webursitet.org/Files/file/5806042442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+long+to+get+background+check+resultsPDF 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_off000154c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CD3 17632 bytes
SHA-256: b9596dc3616926eba9fdfc2f6aa4b968742c2eea2ee887fe89ab113dcf7a6642
font_02_sfnt_off00019b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B35 10964 bytes
SHA-256: 94d4b110147277947691e57c7652d7bb697942840f727b3fc3e7168f4d65f737