Malicious PDF — malware analysis report

Static analysis result for SHA-256 88df3b703b1a8ce5…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 18:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1b05adb03a655492e86bc3d528aaeab SHA-1: a3bfab21a89267b148a37d8a95bfc80e4c50e25d SHA-256: 88df3b703b1a8ce5149ba371c5ca62f3b5ffb27e71b11e4ef74bb90d17a23f3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=white+house+trivia+questions+and+answers
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c45220b5---ronezumuvefuwu.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bac003145c8---govutokubogiwi.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/38dd181de529fe6298b1dcc74ca994be/65590251950.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/89672687154.pdf
    • https://heritagecambodiatravel.com/userfiles/file/rekebilebevoj.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/683e3f2e5e1244c84a764abbbbdb80a0/44506938676.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f5ced12b08c57817555e9a63a7e4f89/99500155568.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a52495ff6f---66494276186.pdf
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/84673948223.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160835c02a7f8e---zufajubijo.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea22e53086---fifupapusibawep.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/l5lh8o41l273fbrneppimk1811/96017035812.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b398ed6d287---nezob.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f9c79cc70---82116799659.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f47352e6c---xivexa.pdf
    • http://bhhangkhong.com/upload/images/files/nilawizebinuzaxavur.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2482d2bd7---rawud.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3h2oagjrak7uolu23l0lveqnt1/wowemafowasej.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/8glrlcjsics073fg6rguqehera/85145363398.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0154cb36---lozuvidov.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5ff00405b9d36ef5e10c1123e141cf06/85034069585.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/03v9rst71sok1734d974c9kfsd/30711947103.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/51451568097.pdf
    • http://pc75.net/upfiles/file/1620904763.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f48b.bin
c3c8a0f00e3141b8d4052f9081c2df9f0fc341cdc40ee2b0f929ad629d692a6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 10688 bytes
font_01_sfnt_off00010ce1.bin
29445529eaf9af247ed2342f71a17296638bc64957193a5f21b3c23d7e3df557		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 17596 bytes
font_02_sfnt_off00013b08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B08 16792 bytes

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