Malicious PDF — malware analysis report

Static analysis result for SHA-256 22dc13fc1675f0c3…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 01:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea1b6df291810069e6ff1cefff72cb6c SHA-1: b91dc9831af9c90ede816cee43b2db1f487ec4c5 SHA-256: 22dc13fc1675f0c3a4b153e720828c177f17c938583f05737eccb2ae9522d9f1
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and ML classifiers, and exhibits social engineering tactics consistent with ClickFix attacks. The document likely instructs the user to run a command, which would facilitate the download and execution of a secondary payload from one of the numerous embedded URLs. No specific malware family was identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://drafthe.ru/uplcv?utm_term=windows+10+spatial+sound+off PDF link annotation
    • http://nuitsdartistes.eu/images/file/dovudabusolez.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/16415366739.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/soxupotadakafitusenawaba.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zenotufepilupup.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/dipepaledixonajuluzefoguw.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/83788216361.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/85965035387.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16081242341953---xufonuwikapelun.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/0f4579c05a0de540503635069ddadbb5/45285386691.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d28265eb98976ff9e32287a8d1b673f1/22814690775.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/potinirurebunomunasafeza.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/66150068174.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64010a1cc---fuvitetebokiworavi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607786d8722d0---36023581891.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a638d55eab0---kijejotavefivo.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/sekoko.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/zaxorimiputoxinujubez.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0097bd98---sitepiminidirawix.pdfIn PDF document text
    • http://sdes.in/uploads/99114250089.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/venibasepijanewati.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b68c274dba41a4634122038925cf8cc4/94128815947.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/56228562677.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d088484c155eb6a50e65427fb08f5a48/gutare.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/72916724080.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pisotubeduwababu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/85307528248.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/15520498931.pdfIn PDF document text
    • 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_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 10612 bytes
SHA-256: 89e3548940f4665ae2e86e05ca510031c7a3daf51dfb5f0b8b1c63f8237fdf6b
font_01_sfnt_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 18148 bytes
SHA-256: 5117e4a0af5b02cf30b9332157cfa2b703aac2571645393eff54ced123ba6578

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