Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab92a1e266e9aaf…

MALICIOUS

PDF

86.8 KB Created: 2021-07-01 11:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce1b663f52cd38b6a3d5372e127104ef SHA-1: e76601e70e0242bcddee901e43ea249c50aea7cc SHA-256: 3ab92a1e266e9aafebbd47d6ab6bd1a240255f05f349255f76878aacef0ba131
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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.
  • 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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cc6c755ae---26986148689.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd32e6a0aa---wikusexe.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c677cb6fcba---72755181623.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/6cf5b3560a90801feff86f5a322cab58/6240162901.pdf
    • http://kappp.ru/js/ckfinder/userfiles/files/siziwamegofevup.pdf
    • http://aisef.org/uploads/userfiles/file/file/nulagoxaxomodedetinaxivu.pdf
    • https://planet-for-events.de/userfiles/file/puvodipurinavelazu.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44f17243a7---2966666838.pdf
    • http://kursadowicz.pl/Upload/file/tigakugojipanupiporukaxi.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d462421a---44123873382.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160860f9c2540a---86502641499.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5e088dda8---91375557016.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ebd3caf85d439e1be7a37e653554b25f/toxaravekazulotiwanokuji.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607729a0d0b40---86764979461.pdf
    • https://pmms-online.com/assets/file/81036232682.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0085675beb---xoxafutobifiruwipoxanuwi.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b7d1afbc9---79235759220.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb87162b69---belomevomijesozetone.pdf
    • http://megalabsrl.it/userfiles/files/34157822809.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/7701b3db6b1ccd2ddddf31bdb580e29a/75492776099.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/gavudajegezinufasisezudog.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c3402a3dd---11363534660.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607270ecbd696---11601544328.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aca4afb9906---bulapa.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a58d4c47d---magejarumidofidaguwa.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608d296134e3d---munurabudivalo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=treetop+learning+center
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d28f.bin
03841bcaeddd6cb6f72cdba6d5d1ff6e95e9facddf55f77fceacbb9cc581023d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD28F 17820 bytes
font_01_sfnt_off00010108.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 16792 bytes
font_02_sfnt_off0001191f.bin
b5c8476a50b26b312e9d2107a521da4097d3462a02bf52744c08d7c9646733a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1191F 10344 bytes
font_03_sfnt_off0001308b.bin
e6fc6a9c1281d25ac30be5f200f1fbd3e4a195ecd8c7dcb4fe3b57e9857c4972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1308B 17756 bytes

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