Malicious PDF — malware analysis report

Static analysis result for SHA-256 1741f45051beb6c2…

MALICIOUS

PDF

76.4 KB Created: 2021-07-15 09:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f53d137dd64308d2c910f9e4c4967b25 SHA-1: 03df2fd5791cc2a77f1252ab2951e0bf269e5ec5 SHA-256: 1741f45051beb6c2ab1a899ac7797a2c03686aa9e203fa660d1953a9f701d863
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 ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crewmak.ru/uplcv?utm_term=gino+bolognese+this+morning PDF link annotation
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076f2e8be7e3---7582625356.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5cec70a1c---vowanizokuzutuzimuzi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cae1817861a05220bd6018e66001434c/xogozigifuxinijolala.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/fejizewajagidukepeko.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbbfe2a2582739eecb3dffdc112c7851/fukolo.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/vexejidipojujozekitiva.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/koribekufivuwegasafugefat.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac202d70497---38777445868.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea00a37831---76426554083.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d70d33f604---29994893706.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/julexobotigefipasob.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/798959074.pdfIn PDF document text
    • http://envigest.cz/upload/file/gumuxalofiraminewo.pdfIn PDF document text
    • http://artside.org/data/temp/file/95410690202.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/57a387a39b23d3b1da5476901e938b87/nijovipexidojaranotu.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/29406328692.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210706162557693359.pdfIn PDF document text
    • http://thaide.org/userfiles/file/zowopivekulut.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3cc74fe39ccf564dd784ef90b49f6050/75304354445.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/46640696592.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9db818f9c1---32003626879.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/76777640993.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/pariwitarimimoxozobutad.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/jivobupivijugezubutaf.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_off0000c65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 10572 bytes
SHA-256: 1cb90062010c2027052ae0062306f23dd5d79f3c9f86b1e89446d4aabfcbab97
font_02_sfnt_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 17264 bytes
SHA-256: be4c051ff30978e03e533325870b1271a40bf1a8efa486e0811ec4e9ca606571

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