Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb4e2ce2df200f0…

MALICIOUS

PDF

90.2 KB Created: 2021-08-07 17:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cc00472932af9b6cbbbdc21525580c8 SHA-1: 7a0999585201b87bb1a1754469f2a9c1b27668ad SHA-256: fbb4e2ce2df200f0b541ae83f498634616e4f6365be3faa84a953f967b9bedad
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lead users to phishing pages or download further malware. The presence of multiple links on disposable or compromised hosting suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/9f2010442d457bb78c1447bfd9f90ae1/podezodinozepulijik.pdf In PDF document text
    • http://podiummoda.ru/userfiles/file/ladanaxekuximu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cuphtphq893hhlets1r2qhl5n5/90299269813.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/puravapanota.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/tni5ocr8cu9oe2g8h8hdk20m8t/35245253555.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/29ebb8e5ef6ed42a362a60424eac7315/84151378135.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69a32a1ea7---46269876115.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca82a6808---20065810365.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a69bdcdd4---molibo.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/disenusafeboxugoresusakuf.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/vanig.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be6853183---90898375905.pdfIn PDF document text
    • http://kelvista.lt/images/files/sexoduvap.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/zepedawiwisofiresofibumip.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/15151535890.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095b50667342---rudalemetevozafe.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/9qbd3g9pcviog3r5mj66m8nh24/56626248945.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607db91ce5015---bukokul.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/66624498550.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/suboxejaj.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920aa36343c---pifolep.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0omk0irgjuvhtfvnt7t2g3pvi3/sidejuxuvomigofeloseb.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/rijenoxezawupavivinuwujav.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210515181250.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/4279873816.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/2be64facc4614ade1fd01ede1cffd976/zawefizulinowevasuvuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=is+ostrich+meat+eatenPDF 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_off0000fc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC65 17112 bytes
SHA-256: 89072ac7fdce6fb749c70d1d18c42792dfe4fc709e95468f80ad78a46c4e0c5e
font_01_sfnt_off00012943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001415a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415A 10400 bytes
SHA-256: 00d71e9970edc45ef13573ff4c7e07cd694586223e0f8a22d5387cad86181fe9