Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff22df40cff13ae…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 01:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f6470033e7e2ada79307f312cec2fd4f SHA-1: 5ba149759ae0d8e8abf9c4ada7cf6c596a3f7979 SHA-256: 6ff22df40cff13aeaff28f06df4884a17e868b2521ea15bdc5cfabc4db4a829b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ssc-ras.ru/ckfinder/userfiles/files/78008913933.pdf In PDF document text
    • http://swotaweb.org/img/upload/file/nunavut.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/mekabin.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/minadijamodulimuditodi.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/11957482160.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/45619198012.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/845c1ee60003711cadcf29a21f6136c6/42892154994.pdfIn PDF document text
    • http://cabini.it/userfiles/files/makaxikibudimizi.pdfIn PDF document text
    • https://ubranni.com/uploader/files/6844724273.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/wowojotomagupote.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8fc2fa9d504dfcb5f09c16fa83dde434/29431903568.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1610757b9ecff5---nozenuvinoletugozijavo.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/67421518354.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/jomurumotopewupa.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdc08b9de4---9497632934.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/v7vjemcjtjusn9v6ro40f0okk0/gilajokapizotosaliwatijuv.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/52345205276.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/48635122459.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/lelel.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/netejivofuvon.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/12049487703.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e325634d3f---30802583910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+song+spirit+lead+mePDF 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_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 16908 bytes
SHA-256: ebb501fe6cac80244e8d7cf84ecbc26d1b29bcca66f22e407d21a8bb2738282f
font_01_sfnt_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 10820 bytes
SHA-256: c4f1c3af91600ca434e0ec3c97ba9afeadb2c5081f4165bddd868681fb8157f6
font_02_sfnt_off000117ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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