Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecc55e0597aeafd…

MALICIOUS

PDF

87.9 KB Created: 2021-09-19 05:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9badc3b86c5e505157464f382f4cf48e SHA-1: 5c43a996e699dae715bd2887e2520397edd13a1a SHA-256: 4ecc55e0597aeafd966c98711b510c5d91ee242b3b073354e6f9b7e992516bd1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a lure to distribute further payloads or conduct phishing. The presence of a link farm and the 'SE_CALLBACK_LURE' heuristic indicate a pattern of directing users to external resources, potentially for exploitation or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=android+9+user+agent PDF link annotation
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc55e152d4---pokewusifavo.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/73925336afc47cbcc2905f8d6c441df1/zigibaxemepunaxawazife.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/sipodiwufusu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161380489f21cc---vuvadanawovugubuvedixeto.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/wogabuginokomar.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/degefexunurun.pdfIn PDF document text
    • http://eternoohydro.com/d/files/15178236191.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/82664361739.pdfIn PDF document text
    • https://coevent.ru/upload/files/maxuduxakuzitotozunulix.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614483196c001---rofobejila.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/xuxenugajo.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d538db9bc8---migadovofubuk.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/muvegupodazebe.pdfIn PDF document text
    • http://zerosquareonline.com/file/49979575915.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/66932888007.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/13949529302.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/54693426738.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/revimozepe.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/kasuxafut.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/wekupiduzejigopuwutadex.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/11027133577.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/bolaxifusepa.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///67717421799.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/bafoxavipivigugapi.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_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 23256 bytes
SHA-256: e7344c6bfab84a1d68fe50a3b2b85c58ca4cf9d395b63b61606dda062fbaac13
font_01_sfnt_off00012089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 10624 bytes
SHA-256: 4c99053f064ab8489f52863ead34e4e020b8e74417d78d6b4db3707517f5fa50
font_02_sfnt_off000138d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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