Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ef62b689df4e79…

MALICIOUS

PDF

74.5 KB Created: 2021-08-26 02:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d46130c2b4a5abf2bde2aef5caf67d6c SHA-1: f34660cbdb32de333782100ce588523ad03570eb SHA-256: 33ef62b689df4e79f90d5787b81792bad1eccc1eddb51d424dc503f3ac2b4e91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links, many of which point to external websites hosted on compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The primary attack pattern observed is the use of a link farm within a PDF document to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://propactionvehiclesuk.tv/userfiles/files/maniworojonoxavolu.pdf In PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fdb099ba8---dakikifomelisulewatebu.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/94trsusp9je8j852etsvlppfb7/43245128187.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/21823858368.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/rifizil.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/89836197198.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607af070750b3---34725752034.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/sigejuwudorizolila.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/16334295739.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/82591420239.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609452ddcd31e---mapewupimiselunadamu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e67bb9392---waruzinekatufopib.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a3c7b5915---63217258545.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/bidufalunezefasimujemamiz.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa7d0848c---tipasumopenuwaworuw.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/sipenowugusi.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/69764875760.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210818_163007.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100dae427a40---tovexemagovoreb.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5ea5fb2df3b9300b53719e51c6be872f/kitupapiposokotefu.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759695c355c---69357308937.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/92913620308.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/riboroxum.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/30809368632.pdfIn PDF document text
    • https://eetravel.net/file/woxonupijamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=outlines+of+indian+legal+and+constitutional+historyPDF 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_off0000bfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 10992 bytes
SHA-256: 3867fbde4c53ada07d2cb3a9dba9d9ca621946f3f9e48d36195af285916dd780
font_02_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 15700 bytes
SHA-256: a115d0ad99283cf8c1f684170b1ce7877e2d8bb4633c8f3e3dd25d172b43cfac