Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c56a3877811b175…

MALICIOUS

PDF

106.6 KB Created: 2021-08-08 00:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 298fecba622bb2b63724d282ae3a7b9c SHA-1: c0a598ff75c035e57f55c13f88543d06b15abd2d SHA-256: 3c56a3877811b1752254f87b5b4a23a01c37ad5c5f07d6403079e98e88bd8105
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a payment redirection lure. It contains numerous embedded URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to fraudulent payment sites. The document's structure and heuristic firings strongly indicate a phishing or business email compromise (BEC) attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://catamma.ru/uplcv?utm_term=when+does+navy+federal+get+paid+this+month PDF link annotation
    • https://soechi.net/userfiles/file/19553701115.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/90605795367.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079d753d3a9c---77289079437.pdfIn PDF document text
    • https://33mobility.net/uploads/files/melixalowuwubigivenotedu.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/0316f63410624fa2002ae2884bb802d6/samug.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0c1f20619810a7774e75bff09024a8cc/zedefujivowu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/g82todgj768s6t5l31mk6qseu0/wuvadakosajepagu.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107080728269890.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/27805547184.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/sunibosifetutijimarike.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/mesajinafukudaxusuwel.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/pivir.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/97963087467.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f356fb28c6---40618855831.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/zazagigipudoza.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/gofawozesibavola.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ee9d935cf---99414743471.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/43082340346.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbc43a3901---lojigamesinonur.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/v6idjgj8a5o9o6u0qaeja5nfm3/nolotigebegebirenofesedot.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/tarexoxavosateva.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d9d02586f8faae883dbfe55feb1f62cd/kivusinenixovexisonigike.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/918a27873b3251b5d07a6ca2b16eea9e/lowalavodawexajubetevof.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161001d757da41---22626793959.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210719015920_pmgfca.pdfIn PDF document text
    • https://digireg.org/upload/newasokokudovugoboren.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_off000138ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BA 18124 bytes
SHA-256: 7077da78627ce8be427056f52c780ff298118cc8a8e795bdae210c3099eaaa46
font_01_sfnt_off0001686c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18083 11120 bytes
SHA-256: 655f3d3b75f6fa2249e2714a97e1471e4e4b09c1130343b1ee78ef27717ec264

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