Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef16bfef84a978a…

MALICIOUS

PDF

75.9 KB Created: 2021-06-27 03:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a38b7f0b6dafb79f378f1580c000e28c SHA-1: e669f274257e5755118d5d53c9868dd38ec07636 SHA-256: bef16bfef84a978a9367e97631ec6f52248029f226aac8ef4cd488fb88f3d916
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress upload directories or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://bitite.lv/media/txt/122/file/14451993999.pdf In PDF document text
    • https://dcoderesearch.com/uploads/tazukozobupu.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/tonoridorobo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a69ea4560ea---15743590123.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/88061711710.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/962ead3374801a185b94842e1e568d40/pupemojamuworuvotivupuvon.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/665500a2cb601e6d005d3da3d2afc464/tutisizanemiwixotomufu.pdfIn PDF document text
    • http://palami.by/images/file/zitupilutuke.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sebelinavutatag.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5dcb4c9cc---5022722255.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/lesebiwijakakofekexaber.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/mowel.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/satok.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/fatelawodavudufem.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096a51726ed9---42547347147.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/tapozifibu.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/1f44064b9b4196329eff982978220bdb/kutegosisovukeniga.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ecc6ebb98---84023853126.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16071d275b1145---7007441441.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/8v30218eum0i1937n30rgq07dk/xazozon.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e38f9e7bdffaf072fa17a8163f2a06d7/fafem.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a389eda572d---ligiwoliloxeguleduzixo.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a873b8f343---47954585692.pdfIn PDF document text
    • http://goref.ru/files/file/fikijo.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/povujolup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=spontaneous+process+in+chemistryPDF 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_off0000c5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FB 16376 bytes
SHA-256: 88bb7d8f70c802492913050f3d2a847b828ed1f86d0b478721b2c08dd571adf3
font_01_sfnt_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 10880 bytes
SHA-256: 90a0340dd1ccc2620183c3e37458ab838756560bb1bfbe8d032232ccc2723a05

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