Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bddfa81756acf9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 10:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 44888cb20d6f3131a4616592c4c2ded2 SHA-1: ab7b4b0910cd245ec469af81b5ef624f3ec995bd SHA-256: 24bddfa81756acf92341f5111110134fbcda53ef4bde31907a9bc72c40ea031d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised websites. The embedded URLs suggest a phishing attempt, likely masquerading as a legitimate software download to trick users into downloading further malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078d54154bcf---japusabu.pdf In PDF document text
    • https://coffeetuanvang.com/Images_upload/files/zadutedodijafi.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb3184be05---bojemexogululeragesejag.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/povexipezukugibepefat.pdfIn PDF document text
    • https://mmszke.hu/files/file/vevujale.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/rodetepozuzifakib.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/83d61edce2cebf82710c97fb9e92e60f/patosifenoxofitomam.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/47078425756.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d8c6cb642---20875237441.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/puzutalojinizifen.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2cec045b13---nuzibirinexonizudo.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/34f14849260842bd1464a542c61e30f1/29676482608.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/23837500376.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/91894920126.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/00eob4vtn8se64rbp7lbuvjct3/67475253523.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/nanewazumudikuseven.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/87ln7lcpgmkoukqt4bhrboail5/50460946576.pdfIn PDF document text
    • http://boldogelet.hu/media/68168315159.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-06-16-42-22-ubXTf4Jv.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d950f42a29---52092932007.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/xusazolefelizuliveba.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/54ed1c5763cad17ccaca84cb9e1094d2/kilonatujoxope.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa483d2e523---wirijufekafixi.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ad2704d2df2818e15f922b340e47f2bd/zuziperebalajisikezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=adobe+pdf+reader+download+offline+installerPDF 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_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 10696 bytes
SHA-256: 023a40d90f866a8c9c18286237dcc94e99d379e4f9ab6abf645b948294fd0e4b
font_01_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 18340 bytes
SHA-256: 70dba52e74a96c1079e9f05de2683b9b87437c46c2c7c62d5d62d5a0b76179c8
font_02_sfnt_off000122e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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