Malicious PDF — malware analysis report

Static analysis result for SHA-256 21589efac5d87738…

MALICIOUS

PDF

85.2 KB Created: 2021-07-03 04:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e4a561c84a6c87c0b7b2a6fbc43dbb7 SHA-1: a1939c606f8fe7043c86f8d15be3326a022322fb SHA-256: 21589efac5d877387c8057b8a4599f5b0f1846f618941ef533b09d6a7435fec9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm, with many distinct hosts and URLs, aligns with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://taiwancy.com/app/webroot/userfiles/files/57578248798.pdf
    • https://iuoshili.com/upload/users/files/lixemokelokugusijat.pdf
    • https://batikatravels.com/userfiles/file/tajovapukuranovawi.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/96cb648d48cf62aa287dee0a7577544c/50928064344.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/305571a7e23ff3d6aa3533c8c952f86d/10861726309.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb3b47f1e9---22923597145.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/lanuvewug.pdf
    • http://apluskleaning.com/admin/images/file/21874813449.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/pefalibokemuza.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a578723a6f4---66313965519.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16096188f906d4---20198685704.pdf
    • http://maxidmum.com/images/upload/fck/file/94343774192.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f1a7d33a4067bf55f4bdd6c7f412400f/35192808273.pdf
    • http://sporteambiente.it/ckfinder/userfiles/files/topasujurolekenenisej.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/5ab7575ec933634b61ee5fbf879c4346/91076681612.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/46254d9ddc0cfbdd81a462fd6cd2bdba/reviwisefonoxutekifefoti.pdf
    • http://historia-bfured.hu/userfiles/file/xerisolutakojuwukiriv.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc77e58d6---62256653521.pdf
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/pejogof.pdf
    • http://bafiti.com/sklep/userfiles/file/57585519011.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e06147a9a---95126367492.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a35b3dd4b48---8082997625.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe0d0719d9---numefejukipiwape.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b06cfe70---52563859432.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49c0a161ac---1507610080.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc1c401a57---kalafekisegavafi.pdf
    • http://rkmaster.ru/uploads/files/paperugizusavozobexuf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=applications+of+fractions+in+real+life
    • 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_off0000e6b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 16792 bytes
font_01_sfnt_off0000fecd.bin
6eac3fb745bd45c6087e93c558df12b82f239a29549628853df2dafca1c52371		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 10452 bytes
font_02_sfnt_off000116b4.bin
9517ce4609c009e8e0e4ee42b5362fee3d279706803ff6c741db078bf8d52fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B4 18436 bytes

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