Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa79ca9fe87e8511…

MALICIOUS

PDF

86.7 KB Created: 2021-08-12 02:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 823212b3d8773a8e9f012e3d13d9f558 SHA-1: c2ac1d2ba6306be76d57804be5c9d5d8a9f54cba SHA-256: fa79ca9fe87e8511275635aad90d5b398baa8b1aa6e38b2899c8142d175708ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised CMS upload storage and other potentially malicious sites. The presence of these links suggests an attempt to lure users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://karapinler.com/calisma2/files/uploads/bagul.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/41795743236.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd6c29e16---nomolaronoxulefizasegurap.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/vifisirivakomogufur.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/sigotalexuxosuwetoweji.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e2f59443---62302728794.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/pt7so6d2q9kbb6gbhqi9l3idid/22115561329.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/timd173g7gkop94nbv386vqeo7/dewidav.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/009853ce01e62ec7c7678b97616a9591/xokasexitigakebibakop.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/k4q4k0b7041esmkig81cbhdnuo/141646895.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/b90b5a40946e6b9fca74dbe59c6c5801/pituvijis.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/27648073543.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/55049068076.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/geoipkn953gv34em1a19ctto14/tidosatejugovelojazazi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082806446efa---36306372089.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200657851005.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1b45318eb6befabeef56ff3cdef67bc2/fufuluxovekoxi.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/fd08acd262b46833109aaff02f557ce0/wirekexegi.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/38623940987.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ibk0krmhjli5suvcbacp6gdbmm/11888939940.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/00inv5516g828g6ud22damugld/jilodeferovev.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4afc29f25---37097622756.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/ruxeberi.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/sanivixad.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/64322436066.pdfIn PDF document text
    • http://cy2hand.com/userfiles/devesumuviviju.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/88d3de3dc844c338ce2c109b4006a2ca/10936220118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tamilrockers+2018+movie+download+tamil+dubbedPDF 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_off0000e919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 11480 bytes
SHA-256: 98498379da5aef61cc1469efdf1e14c6e23d9b66497c2fa21643f0a5f900db77
font_01_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 17864 bytes
SHA-256: 6fdc67f5b71bbe77dbbfc61e4ec42653db66d2541342864dc308f4a6f744870e
font_02_sfnt_off000133a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1