Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cee5482f9cbe578…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 22:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8ee597337425ad4d0749d054dcc9116 SHA-1: 54f6c64b641dff3e08a85a5912ef5c2e6899352d SHA-256: 3cee5482f9cbe578e342c941f32d6576d19cc54f59174b095db8cd63e85c67b8
196 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and a lure for payment redirection, a common Business Email Compromise (BEC) tactic. The ML classifier strongly flagged it as malicious, and ClamAV detected it as a phishing trojan. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://apra.pl/files/file/34516043956.pdf In PDF document text
    • https://dp-silver.com/userfiles/file/bizujuseb.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/q7i0h9va554ajo368mhlpd6cr7/40053172361.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143bc5d93f3c---nilikejamowitamefenurer.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/guvalemuz.pdfIn PDF document text
    • http://qdjshg.com/files/file/godewisoberu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5b5778a5c1bdcaefb2d75cbacd8cc4c2/fajibu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/dipoputuxuwo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328733baea4---73461080451.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/memunerikixu.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/5a8fda237369b9c3e2b66e440ff98180/tejarenesugiwusevoro.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zilunaxap.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/rasoriwa.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/wodumoniv.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/fovepususab.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/gafogutoxi.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/jitodofalevilug.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/kenufazakimagujawubo.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/48667970371.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/taborisizigeme.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090407080080554.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/dilenobutizoliwajekenaj.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/zuxuduwitoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+robux+for+free+by+watching+adsPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD200 11240 bytes
SHA-256: 0c79f56ce870a5ca45a7497ea76dd98f6cf6d6e47b0546aa86e7755c863a5081
font_01_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 18120 bytes
SHA-256: 354357b51aa5cc06da7dc19cbaa1c606e9edf13c449572936fced642b9b42998
font_02_sfnt_off00011a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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