Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62651f5d54ed027…

MALICIOUS

PDF

88.3 KB Created: 2021-08-03 05:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f46cca0972f1569d2274d5e9644e3c4d SHA-1: e0b662239a4bb2bd1e2a043a1e02c6dcb89f2faf SHA-256: f62651f5d54ed027e647d6132ceed87c5a659d03bf182b1d05ebd0d9870e6bac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be part of a link farm hosted on disposable or compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the document is designed to lure victims through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=udf+dosyasi+acmak PDF link annotation
    • https://llibreriaha.com/img/events/file/fomufuramopeputiza.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/83093074274.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/ruruxusenutitawi.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/47882229681.pdfIn PDF document text
    • http://nineslash.com/user_file/file/56706549531.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/tiniwi.pdfIn PDF document text
    • https://landbar.com/upload/files/dojitobojibi.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16083ad123b70c---tovizov.pdfIn PDF document text
    • http://jarosi.hu/files/file/605744549.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/mubupasosot.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8r6hsf6u44dp6d6ib71lnsvcic/tabaxuf.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/305d8c4047719374728d62b7f4e4a195/60267019594.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/moxavaxo.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/rokiwiw.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/79235250924.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/76f9e11d1b7aded1721c5030757fe007/pawojajasifutamexexope.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/13049268130.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/31948331157.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c55fd14b96a---59083931190.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/e24ribitl7d12v7m310gmhivll/lelizim.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d2b395900---48155366093.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfca651d48d---mazod.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/45215075429.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_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 21004 bytes
SHA-256: a241e4f55ebe1e2e6d50360b5af6c2f2d34f8671a4350db92e1d64a4a05d02cc
font_01_sfnt_off000122da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF1 10368 bytes
SHA-256: 775251d55ccc8cafb4944927d94f8f2eb69dfae8f2696fcffb386334880b0ec2

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