Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f521af7407c714…

MALICIOUS

PDF

108.5 KB Created: 2021-07-15 13:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f73f461fe7065b91cc3442f224d6358 SHA-1: e9f12fc0126be5b761fece6779002e5b0b047c0d SHA-256: 91f521af7407c714744f0db24b703a5e244ea38ef11dcf231955504921195bc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://cargotavio.ru/files/file/gapezugububine.pdf
    • http://jiuxingchaoshi.com/uploads/file/090957473751.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/52939e7a69b1972064c5583ecb60b4ae/bugozinalanal.pdf
    • https://heritagecambodiatravel.com/userfiles/file/13472725305.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160827c2727d2f---tigepaxiragumawigavu.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c205d599f46---57265671221.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a786d2cb467---lanus.pdf
    • http://files.ibiza-ferien.de/file/rixuwurire.pdf
    • https://skinrepublic.vn/webroot/img/files/rutamapiwatizuvoten.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/4770693623.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/72683c0aa1fb0df4fbdbad669e852e11/74750462250.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/92mrunm3uu2g8slca5qt6ffqg4/minonezirosuveg.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160737bff815d7---gorowowonijasedomifu.pdf
    • https://cissud.eu/uploads/ck_editor/files/farotiwowowixekela.pdf
    • http://giaoducvietnamtv.com/images/ckeditor/files/negakamelikopepu.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609de78fa742c---xaxibesu.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/81032485528.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/9ec0e1a9655ee7ad47cd80b545cd52f8/netomunewawegejukimuluno.pdf
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/lazivo.pdf
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/11602372365.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074fe9176472---wisawozizekutowe.pdf
    • http://superlitefan.com/uploads/files/giluva.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087697a780b6---33677183172.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=class+9+english+beehive+chapter+1+questions+and+answers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d4c.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4C 16144 bytes
font_01_sfnt_off000142cc.bin
41142cb41c6da3a842af563cebe09a5ca327624ea359753fabdf169a2373e8f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x142CC 11584 bytes
font_02_sfnt_off00015d9b.bin
ae210ae59d5dbd5dccaafd1d7298fb344c7910f941250b18adab05822057afa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9B 17600 bytes
font_03_sfnt_off00018bbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18BBF 16792 bytes