Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cdf42ba0e2891e…

MALICIOUS

PDF

75.3 KB Created: 2021-06-25 22:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96e286f2a7e0d5b1375b1af835d2672c SHA-1: da08fa203d53b7fb2fd4e306ee1bb9021746c9db SHA-256: c3cdf42ba0e2891e0f4f3f47b32972b1a65051bd8d419810c4dbae121625e2a9
196 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links, many pointing to compromised WordPress sites. Heuristics indicate a payment redirection lure, suggesting the document aims to trick users into believing they need to update payment details or make a payment. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://queure.ru/uplcv?utm_term=what+does+it+mean+when+credit+card+is+charged+off
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c93f2fec0---zimuxexepovudagawo.pdf
    • https://menlopark.com/wysiwygfiles/file/titumarapikeg.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e93b13127---59983200079.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/90473954e9f28faa88e3c79c59debf5c/58025125046.pdf
    • http://nhs1980alumni.com/clients/878257/File/zuwigi.pdf
    • http://ashioke.com/images/library/File/87039123051.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2132da95b0---jolibofuxifoj.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c89026c554d---72595561596.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca8e03ee9---33390962893.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/liesklq7m6q7ih88gnadi0dion/46640560530.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/46916318781.pdf
    • https://dbjadow.pl/attachments/file/bowifirif.pdf
    • http://teusz.pl/UserFiles/file/53635942154.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/68836790039.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/38bbb4b23c0a36115282466551edd8cf/kuzafirovamidisuliwuled.pdf
    • http://nage-z.com/ckfinder/userfiles/files/40293066067.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ff6943af6---39486508246.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2b5590a4d---migajadexajobokupubu.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f8125b1707edf263a65f77f734d8b71e/vivuvezomaku.pdf
    • http://uci.ir/userfiles/file/zunafuzap.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd7466884---nurapubikenena.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/13e7e91ac03c484144b38562f997cd9a/37204457842.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e458a19d6d---kofivujifa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5d9.bin
9c8af1eb90d09f4262e1fc0e39993f3a0967ce047968e81026f735023735ac56
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D9 15808 bytes
font_01_sfnt_off0000ee5f.bin
448fb315316ec123544186c298e94a7546660b3499dc2ce56c60675dd4dfb54c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 10956 bytes
font_02_sfnt_off00010778.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 16792 bytes