Malicious PDF — malware analysis report

Static analysis result for SHA-256 673bb460e30ef3ea…

MALICIOUS

PDF

108.8 KB Created: 2021-07-22 22:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f7d0877ab17c8eb0fb270968744315d SHA-1: 5086d073aeb5d3d809e2fce7715c6912924d7a67 SHA-256: 673bb460e30ef3eaaa7e197178676987ce420f7495f2d56062498e088c4eb8dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The presence of a link farm on disposable hosting further supports this. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://danielbushreunion.com/clients/41596/File/tesokanidoxara.pdf In PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/6tvl02nkc1i6h2uh4o41rddc17/59933970887.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/11211237167.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3ef550304---12523314185.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a479b24c63---fakomagosikawiro.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/sql96t1kqo5j3ek50hfau7614r/ponifefeletiwugu.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/wuputokam.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/88119482907.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/91773986978.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/salutuzijigobamevus.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6a16b6b0e---43924337632.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/3f09b5cae91afb479262867551df58b7/94782239356.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0d6c76d84---47879676858.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609703a703321---gulitiri.pdfIn PDF document text
    • http://benly-carson.com/product/files/721289913.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755b82821ea---88751804486.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/21d6ffb430d3df99b9aba34e2cb749c8/38255098576.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/rawumu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c312b220cf0---42529782982.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/35981507399.pdfIn PDF document text
    • http://toonesk.com/upload/gobuvoka.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/nudofufipawabexu.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/gosexarumitiputudozosoz.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/rpqe91ssum5cf4l2mroqgmuq2u/4144945442.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/d130e9cba5f740b98be4eeb13c6510af/kipawofisabovituxepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=all+creatures+great+and+small+season+2+release+datePDF 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_off0001440f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440F 10820 bytes
SHA-256: 80c9139864411de0b913673aa1dc2e1a4633cc364df5d97409e2485295d7311b
font_01_sfnt_off00015cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17500 17716 bytes
SHA-256: 25b990f20a2e07fb6d91e711b44ad856ea93b5da2ba2a9012887532a363cbc22