Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d6f20dfc9e8bf5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 06:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84749f6c667dce83f61c2f01b8c7b6e5 SHA-1: b48f32540a826f861957e79a0e6cc8a94dfdcd19 SHA-256: 90d6f20dfc9e8bf5d1fdf9969a57fade1385c80a60f0f303b0d9603dd68540e6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://zlatartopalovic.rs/files/bexudope.pdf In PDF document text
    • http://absolutelyneon.com/userfiles/file/xuzojukidebatawat.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/gizebupuvumorazodazu.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/62368803126.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/toxitagazepuwu.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/kesipe.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613097a773ae8---vudedaratofarigoxure.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/96331169981.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/72922893087.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/68491626266.pdfIn PDF document text
    • http://cityfate.com/files/files/81999554646.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/94a2f841390428e41f4f7bb127705fe8/mepefiwa.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///91938002880.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376d8f91288---82625820159.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/40055129161.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/linobare.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/33889413361.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-05/images/files/pukudiwuratu.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/pamodurafaxonad.pdfIn PDF document text
    • https://endobible.com/userfiles/file/xibevowenivemipasuso.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/ruzafeguneguvujeb.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/79608330002.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/vp51sqssibdn0ouk9tr5ofbihl/wibejopawidaratetibazixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=soccer+24+live+score+apkPDF 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_off0000dad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 10596 bytes
SHA-256: fe3320b76804b4fc1c4640a94ac0fbf3985b7a61e4d98011ee604d9ffa8359f1
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 18300 bytes
SHA-256: 0cca54fcfbe0082d878672062e1c5b6b2651d883715f736714eca829892d660d
font_02_sfnt_off0001226f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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