Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5353b0615ef566…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 10:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 26b9b5e9ee23f2ac2785152a185e763e SHA-1: 186cfa346972b0c435d01d32bb44f76865d65fa8 SHA-256: ed5353b0615ef566c9d6bbcd3e09addf0c8fed73b317d069ee758fd2a0a711aa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous disposable domains and compromised CMS upload storage, which is a common tactic for phishing or malware distribution. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • 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://aucontecnologia.com/userfiles/files/totenomojomixefo.pdf In PDF document text
    • http://vizugy.hu/uploads/files/files/tatikixigusadajakev.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/87016620300.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/82902538032.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f7baa27a3612692f887cf667bf117404/jefutesefinu.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/ziletukoloxenasizikalob.pdfIn PDF document text
    • http://idcla.net/upload/files/fijosugekavutapob.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/muresowoxe.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109131615134183.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8e793520f7c5802c771b53e96ba2e85b/98140876748.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/buxoduwamisibuvuwex.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/106f50f3898c3abc0be51367ab1a158a/99929557485.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/ae1e6eadd139c667eaba19de48aa8a90/xomidozamakumolusufeju.pdfIn PDF document text
    • http://riosemarescentrodemergulho.com/ckfinder/files/21838092508.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/dexut.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/woniwizumexolubeko.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/36800818125.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/28639453043.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebaa313f1e---13559914853.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/tirito.pdfIn PDF document text
    • http://arsvet.ru/img/upload/pawunuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+nova+launcher+setup+backupPDF 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_off0000afce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E0 15480 bytes
SHA-256: 4e7c49a1f2bf56385b352700d2547c28f0a9e36c44f9defac199c8e45c185dc4
font_02_sfnt_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 10832 bytes
SHA-256: 4094868903fb89d339008235196e0b28e40ae2786c22206cf04fa82dd4443350

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