Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4efa3921bb0fc1…

MALICIOUS

PDF

79.5 KB Created: 2021-07-21 03:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e359f55e4af59ccd58c03b3ab90033bb SHA-1: 3726d7f6c0cd8e3cbb83046ba624be32a91cb47c SHA-256: 3f4efa3921bb0fc1e70e0ab63f9b89caaad7946100b45748a71497a1b57bdc57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This technique is commonly used to obscure the final malicious destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/15f8ce34eaebea7a6b6b2d8b3893b4de/pokobevopokopur.pdf In PDF document text
    • http://kipia-nn.ru/userfiles/file/fabimitisegudalipefi.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/13om67p6513ek5ra6v3llor5j7/91669891759.pdfIn PDF document text
    • https://steammining.com/userfiles/file/12288934657.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/31880951252.pdfIn PDF document text
    • https://agatanorek.com/files/file/55899221333.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/33181724036.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/85527751972.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/kicuev22l1q03qfuskcear9c9h/4044750203.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/2aabe5ovjvd4iojimf1ejldemv/dumitazorute.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/getuvitijuk.pdfIn PDF document text
    • https://actorconseil.com/files/file/22551633617.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/15685806950.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a222fa98a92---sadatan.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e62830e91---filebudizutevedufufimuk.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841a90b8fb1---28750825202.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/936a19a6055c51270b2adeb27dfc6a03/12898981770.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/58143687470.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/99448890685.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc5deb7f3e---selaputotune.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/48391679659.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/vesorepekepur.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd5091b0b---5323286411.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210531_F52D5F2AEF1B1807.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/eb08d88685f546aeb399e399911ab2d8/45160462000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=is+ice+a+homogeneous+mixturePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 16648 bytes
SHA-256: 76182c7f6a8a84e7511614f5615364bef07bb2e23764edb6281aef48063772c2
font_02_sfnt_off00011690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 10784 bytes
SHA-256: 655818347a26a5f59f86103f0e22ec83c6f4a9c4fabf182801f8014713e7f1c2

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