Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d13998db832cccf…

MALICIOUS

PDF

89.1 KB Created: 2021-07-17 15:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa53be4d93756dffdc85e6e70ec61a2a SHA-1: 6006524929d8153d7b51757dd7d497f42aeda167 SHA-256: 9d13998db832cccf1ab2e7538ba5fc667982618ea6ce37d5d3fcc695625fd9f9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised CMS uploads and disposable domains, forming a link farm designed to redirect users. The presence of these link farms suggests an attempt to obscure the final malicious destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4c5a54fc---waduteximutowujakazemov.pdf In PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fbf61e4b56739cdcca8bf705ddccfbdb/10910681172.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608839ed4e791---lisozozufiwawipebujis.pdfIn PDF document text
    • https://path.mn/userfiles/files/535660784.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/35e41f5a4e13049210ce2ca3004d1dc7/sivipoluse.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///96561513968.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/rekike.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/6765c012341abed98ef75acaddcf3c3f/91872518760.pdfIn PDF document text
    • https://vestol.bg/files/file/gojosapexagegi.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/roxalaxezusesopirutax.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9657b4cc93---61693769863.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210630021926.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/wogusanido.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/007caaf3943fedfb1c842c4aa9164789/vuguligerosuti.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/91a94c374293c3c26f993147dae72dd9/42218918418.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/wojogamijemesug.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2db9c5527d---27479602747.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2f6f047e7---puzizaburuwikuvilobuw.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/kubeketefaberagetipelovig.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/15742464171.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/65443666075.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/64582244678.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/9003428542.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f461806e16---talevewexewaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=2+equations+solve+for+x+and+yPDF 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_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 18548 bytes
SHA-256: 91fb7269573e5dc2c3fd534cc5cfd8ff8e619d4a58a785ee2ce68c120a20d470
font_02_sfnt_off00013e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E08 10896 bytes
SHA-256: 8690233a1b777ae9913d1a700d2a4aab0c798387eb86efb3ab84b2263eec0013

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