Malicious PDF — malware analysis report

Static analysis result for SHA-256 91da128c1d70bf25…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 10:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7312d2d3718226917e63a62fbf925b0 SHA-1: 593cfb93e2d8661be02152afc3043c9e93b4667d SHA-256: 91da128c1d70bf25193f50efb096c43ce016d5dab3f0c29e08dc88a5b93e6c8b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pnktools-th.org/ckfinder/userfiles/files/32945300432.pdf
    • https://edubox.mn/uploads/users/0/files/pizoxelujaja.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/8s3duue2elovrr91cclr0veh37/36968435268.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c90a756a---89715942735.pdf
    • http://vantaibactrungnam.vn/upload/files/rarutumevoxulurewoma.pdf
    • http://lahma.pl/_u/userfiles/file/gapujazebuz.pdf
    • http://fine-cottage.ru/userfiles/file/61083246393.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/46ec254cd376753843d2a6898eb483a1/logukudobekibu.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3c3105554016a09fa38f83fb322a6fe0/zebixizisevaka.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0c4a8830f73b48092feb091a12820a8b/ninerabazupibuvamug.pdf
    • http://dezis.ru/uploads/files/77650980738.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0a8f04a9c---zefejiwad.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b88569202cb---tijekuxesimeratufuwup.pdf
    • http://jar-ted.pl/file/24118544865.pdf
    • https://ndmoyun.com/calisma2/files/uploads/zexodeseg.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/bebef91b78f58365a834696f0c32418b/godufivux.pdf
    • http://firegallery.ru/img/upload/besuzovuxuluf.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/165c4914fb46818b8b05c505a0555b82/nisafodewijekusediguxu.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45f1f069d1---54247288674.pdf
    • https://cesiedizioni.com/userfiles/file/pudelotasotelesiteduban.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161194be12a0c1---27785787397.pdf
    • http://sungwoneng.com/upfile_editor/2021/files/97788724407.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=past+perfect+and+continuous+exercises
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd65.bin
28c0f6c27b404ae8f5862cb27fa0d8acc5d1b9756a6ba6056d63b4f321783688
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD65 18800 bytes
font_01_sfnt_off00010dc0.bin
d364cca217d82ce1b22d1c837e89197b12ec7884cd5bd7366942d4d26cc802dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 10768 bytes
font_02_sfnt_off000126b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126B8 16792 bytes