Malicious PDF — malware analysis report

Static analysis result for SHA-256 55131f1235d14cff…

MALICIOUS

PDF

89.0 KB Created: 2021-07-26 00:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8fb44d7965c203f1d49541881c8c808d SHA-1: ed51949a3bb17ecab83c0d53d8501827b5201a0f SHA-256: 55131f1235d14cffb94376df7ef63d8b70303d43c2a5c3653e54dcf618151b70
156 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as a link farm, directing users to numerous external URLs. Several of these URLs point to compromised CMS upload storage, indicating a tactic to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/237b59caaee1ab28706b046428151b68/fomivaximemetana.pdf In PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/85516630191.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1f48ae743---91309693500.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/262935380.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/734617229711620590896.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/3d4bc45498bb916f172a01bd89ae4d0f/81956523639.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/berotedexinodar.pdfIn PDF document text
    • https://unosms.us/userfiles/file/6728256179.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095da48bccbb---gipiwubil.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/41594291003.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9d3e14715---xilewapamitegaxibabitami.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/729850657f70dfab0583918bc7b09d9f/zurelud.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/70009277498.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/64396736658.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcef685486---lotama.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160883fcc86863---55631973126.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e9b5a9e255a8bf1fb02d845058ea9051/volerugew.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/diruvutiguwaniked.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/obfgf485nhvafscfgqvh7ejnbi/22865747449.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/woluwominiziwil.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/42374571261.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160baceac6ed62---kopopaturoribuzozosafisiz.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a5d2dd7242aa5ae65ab86a501214a9c3/59437074786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=homemade+murphy+bed+free+plansPDF 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_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BE 10920 bytes
SHA-256: 554bd668ff43a79c42a8a300f681817bb7be77ade53e65d04a37136d235b1c6b
font_02_sfnt_off00012a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A85 16904 bytes
SHA-256: 00dbb5bfb5acd88f193847d4c0d48018748cd7345d5878c0ad8f488c081858f6

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