Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2406dec577bae35…

MALICIOUS

PDF

86.7 KB Created: 2021-07-21 22:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7249eb5eee45dcc6eeca313c9e6bcba SHA-1: 4986508a7d8d7c4e6bdaca71150f48feb947687a SHA-256: b2406dec577bae35de3cb3924c273b13d579d7479b0c3e0305b33fcf27243ed3
196 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious or unwanted software. The presence of a 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document may be instructing users to open a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bfr-bialapodlaska.pl/userfiles/file/rumodimesome.pdf In PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/10091130370.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b47c5e010---66329823151.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/vojipuneriri.pdfIn PDF document text
    • http://foodchemsino.com/d/files/lamuzesalepumupu.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/97684700011.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/57d38b736921264f7b5e34b94b94192f/kagusopuwalefejepunaked.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/gatomapojamiwedetomuli.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/62970915802.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d309d3b4d2a---81390169399.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/35hvud88itf5u5jl1mbbrad0i1/10297042067.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/54621612013.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fb5cc58cb---39299535508.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01eccabae1---gikawobode.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/17746617013.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/bajinipimidaxowefi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b6e624f0e---15983844200.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/jumaw.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/jefotedamepalujugol.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/15685806950.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ov7gt6clduops11jjdgup363ug/vegugosineg.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cdd0712ca---gikebajajewimaneko.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/puzusakivubo.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/64840727575.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/91724245771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+minitool+power+data+recovery+crackPDF 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_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 10864 bytes
SHA-256: 9b52c6ed3d3fe11938c3313b67c0217fa7dbba01d319476f447208e302e4d830
font_01_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 17756 bytes
SHA-256: 4394f21e4238e8cbb189a7307d859a4dcdb5e8278f07ace7ff11dedcb8220486
font_02_sfnt_off00013553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1