Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1807ee60c6ac66f…

MALICIOUS

PDF

80.7 KB Created: 2021-08-18 17:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ed7f56a0dbe038d1d01468d82f02313 SHA-1: 76f8202e5f81755410d7297bdf1f7f1743dda37e SHA-256: a1807ee60c6ac66f59d6a4df92bbcf03cc29ca9257947c7a62d9b123ff8893c5
212 Risk Score

Malware Insights

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

This PDF document employs a payment redirection lure, instructing the user to access a URL to update banking details. The embedded JavaScript stream likely facilitates the redirection to a compromised website, which in turn serves a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=double+entry+accounting+system+in+excel PDF link annotation
    • http://jhdljz.com/userfiles/file/1625331888.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160860d2118a7c---52914129157.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5beda21db1---87887576069.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/5551ca315cd1fb7b80a0d726b9fc8f6c/mawiwider.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfa8393b88---fukonobujoxajezagonafeko.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/winitirawimanipe.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/87d105e12fef509418fe3864fb97ca61/lufuk.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/wolizev.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kltfj5fv19me9j44qocupk3qth/bilusufexuka.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/df53d48ff8ba757cb8a0cc054fa3b343/34417895841.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/dopimuvuzobasojerigiriki.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/u70jfa94sdvqsjm0u9335pfeet/6457813552.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/96r9dgvqflamki214btf0n0ge2/81270498173.pdfIn PDF document text
    • http://blueyee.com/upload/file/030820268924.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///49537884707.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/xamosadodowozodebulo.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d58e0f445a0f801df1a5765fda7294c2/tizopaboju.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/86117785836.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea83e80f9c---47774906446.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/jejabarisijanegasenifu.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/86526232301.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/xuvevinuxomagekexet.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/612918490.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_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 15860 bytes
SHA-256: 2cc22842df6496969288b4d06269c2572dc4e0777a90a8a1808251abcfe49ad9
font_01_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 11028 bytes
SHA-256: 00c328ec5dd5053820af479d550ec5a5c050fc0ca209b7d445ae3fdf4d91690e
font_02_sfnt_off00011c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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