Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dbf0a9c9284d28…

MALICIOUS

PDF

94.7 KB Created: 2021-07-05 23:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d8f8439990d09c86edd292dcf8b750d4 SHA-1: 9e7de8407648c7b64d212abed08b926e6cee65cd SHA-256: b3dbf0a9c9284d285648b35bf74f99c51278ed9f4906af171ce8a5e511cdaaeb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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.
  • 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://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3caeec194e---51344524079.pdf In PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/rofodarekesezibobifasef.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ce5bf338e7969f4059d28cf8a5a41581/fosefarasesifon.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/83946838868.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/xurajidexijorutekoga.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/a0mr845d77fs7lpoon4qcb8mjc/66410366439.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/aiuaqfgbp3j5t8nst9a223c226/41584109053.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/3d4jcml3ban7mo83u2oks27un6/jimabekowugemojemo.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/51070856699.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ss7uh6k52bdvbaq1tvc8ngpl7f/sidusexibegavexamiwagug.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/zomatakaruxezup.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/48027915985.pdfIn PDF document text
    • http://blueyee.com/upload/file/122215483214.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7e34c8524---99409229022.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/wezodoxuluwulelanaxa.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/20436127568.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/7e4200626cacf8b8d03b61e271193bde/zovisofokobikajanegogaxur.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/19328493005.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/21625949474.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4aa5907f---50470730438.pdfIn PDF document text
    • http://splogservice.ru/content/file/7095410197.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/504786225.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wozesadusozuga.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/5ktb5k483v35vpesea1fn3imhs/5856504225.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723099bc83c---87276830781.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5667e2e413---59337861772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=sudden+itching+all+over+bodyPDF link annotation
    • https://medlineplus.gov/itching.htmlIn 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_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 17892 bytes
SHA-256: eb41feb05b08fcee9b1c895b97efd0d2c7c3061fdbc9063c0f7956534b1e8b8f
font_02_sfnt_off00015410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15410 10976 bytes
SHA-256: 17b9e176c87c45b38a6c0a3850f40adef842ce61b0c4c2a15e8be25e68e1c1c9

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