Malicious PDF — malware analysis report

Static analysis result for SHA-256 129eec5908faa122…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 23:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 39a6e1cc1dc26452e164e4e03b94c91e SHA-1: b3297978383939c7ef01223c758433bac5cd4e72 SHA-256: 129eec5908faa12260a8af0de346905308f25e38bb83e259e23fb4f6fa37547a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The presence of these links suggests the PDF is used to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://przedszkolenisko.pl/userfiles/file/12793900718.pdf In PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c6120dbfc517a4a2146b1d18629f6bcb/73940688278.pdfIn PDF document text
    • https://digireg.sk/upload/tobesuvejetikavitarak.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/totirogupimuwibifo.pdfIn PDF document text
    • http://fedime.org/imagenes/subamaxisiz.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c60c2a385f9---nerowofebika.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/627db001f53a538177e1d1a5b15f953d/wesabidipozegimisujiz.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210719_DD4D79BEA03A7F03.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bbsf3k52sv5h9a81ot4igoudcj/56721168867.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/23007312759.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/clh0e8bbdfle7k33knr13nho9c/29491076753.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf105bba5---livuni.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096613458bb9---vonitixivusefimubo.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/99902016957.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/89626567817.pdfIn PDF document text
    • https://medtek.vn/storage/file/gadojijuwuje.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/namuwox.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/47275805709.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/49148495448.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607da0db9f5bb---rivinegiwelarijil.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092339935384---nesun.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/16081436402.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/63037258329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=high+school+classroom+rules+and+expectations+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_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 11260 bytes
SHA-256: ccd1f21c7dd18d331593cc8be3a2acbb0bd01997069100d85d95890f1a8fe650
font_01_sfnt_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 17536 bytes
SHA-256: b1ee9b3244f0de6e39bcc088ccbdceb6df3b986ba556da1f2682dda5113b71aa