Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7330b016770a605…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 01:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c32425baecc642f706115da2b3bdfc2 SHA-1: 1122b4e1f39046a385d25e678edd37553ab4bd20 SHA-256: b7330b016770a605b9b27870b0513d7fac973445db3152eed203f54ce401be74
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1204.002 User Execution: Malicious File

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The heuristics indicate social engineering lures such as instructing the user to press Win+R or paste a command, consistent with ClickFix attacks. Additionally, the document contains numerous links to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. An embedded JavaScript stream was also detected, likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 10

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=cast+my+screen+on+android+tv
    • https://rawoctane.com/uploads/file/fogurovemimiv.pdf
    • https://skywaynepal.com/userfiles/file/rewaxewexotipiw.pdf
    • http://trevelsi.ru/ckfinder/userfiles/files/3004717650.pdf
    • https://profitaler.com/UserFiles/file/funugoladodiw.pdf
    • http://kstarsmall.net/userfiles/file///43017447287.pdf
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/fulepi.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ada4bc1a00---20532374628.pdf
    • http://tomei4x4.jp/js/upload/files/92287992038.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/magejo.pdf
    • http://rajhansnursery.com/userfiles/file/lobowananurazafo.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e0ef4c374f46167f03d33360e49fbd45/favokapuru.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387f3328f29---2361738711.pdf
    • http://shahgrp.com/uploads/37710970688.pdf
    • https://kiptep.ru/file/24150962946.pdf
    • https://mobilaide.com/upload/editor/file/fukezuw.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161325107de128---zixuruzap.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613341eecd8c8---47727131510.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6dab88d88e486da182c3825fa2e05b8f/51590109358.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161378ab2dc3e2---tegexok.pdf
    • http://tubesealer.com/uploaded/file/1329979795613d6e55f2814.pdf
    • http://owv-sad.de/userfiles/files/gokunosowebanedeko.pdf
    • http://asesoriazabalburu.org/azaba/files/file/velizejezujadilapugon.pdf
    • http://thecuriosityshot.com/dulorobilunopem.pdf
    • http://fli.edu.mn/ckfinder/userfiles/files/biraperamiv.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/86724170817.pdf
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/1380533144.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_off0000e023.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 16792 bytes
font_01_sfnt_off0000f835.bin
dce9a27e45dc65a99b3660afd4beec6849180e08b066e300aea6f78b25b3902d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 17556 bytes
font_02_sfnt_off0001250d.bin
f3882c3cebe5b8c9da6feaa302aee2b9d1f43ee5b4c20191687833f745143a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1250D 10696 bytes

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