Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9a58779eaffbaf…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 01:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 74df1a688cb5a924ccffb81dfd07fc2d SHA-1: 7cc88020702052882386f42d799ac1a7082b2878 SHA-256: fe9a58779eaffbaf1fa2b17d4039478528d0dd939242898269f0b359d9346de7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious lure, likely intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://qianxi.cn/filespath/files/20210901210902.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/nbc2ct4l6piodbosb3c449o5k1/funatejirepoli.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/75087f8e89027af3be9b0e0a5f6d0886/refovomeruximubigix.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/mibisuxemavamexuv.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2ce58607141ab9b46f50e3c38c5fb251/36990463582.pdfIn PDF document text
    • http://kotolantopeni.cz/file/gerumozifogirowogegure.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/96318009842.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/katimisobeguvovowowojuje.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210828_576C3DFBA02A7BE8.pdfIn PDF document text
    • https://wagaskar.com/media/rafezaxav.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/74201780005.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/71923059174.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8ddc3d1c---wepata.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e69dc34d0bb00ace4f9953a1159690cf/4987611649.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/tuxibiwux.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/nasaban.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/49596653363.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/tobovemebenok.pdfIn PDF document text
    • http://honda-vo.com/upload/file/vaferexa.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/gibefuvokegozowomadanom.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/1039187229.pdfIn PDF document text
    • http://nccutrackandfieldnation.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/penideku.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021083114075642.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/74587082907.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/potiluz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ultrasonic+flow+meter+types+pdfPDF 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_off0000cc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC69 17036 bytes
SHA-256: d02b060b4c86cc51f30ab00f6d4a8ffc403647f33c88f0778e0922ca7e16009c
font_01_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 10988 bytes
SHA-256: d7a2ee59ee3690a504f997d9073741f99af302a337e1ce36f692fe2a8615809a

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