Malicious PDF — malware analysis report

Static analysis result for SHA-256 d740703292614244…

MALICIOUS

PDF

74.9 KB Created: 2021-09-03 05:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88471c061d609937ff3be9128101cd07 SHA-1: d28c69d92de67ef5317b27eeae1d1b1130b76451 SHA-256: d74070329261424419af820dc77acbaf95fc2729dcf81ec3f197b89ef1af16ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised or disposable hosting, likely intended to lure users to phishing sites or download further malware. The PDF structure and embedded links suggest a tactic of using seemingly innocuous documents to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crewmak.ru/uplcv?utm_term=negative+numbers+and+integers+for+grade+6+worksheets PDF link annotation
    • http://vertracapital.com/uploads/files/rodarirekemaratabe.pdfIn PDF document text
    • https://songhong.info/userfiles/file/bugus.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/888479082d32c563f4b9496d4347490a/47741603310.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/94660245907.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/16254753583.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210812_7A2DA34F8E1B9AC4.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/12aac71d0695bf7c120d731ca29e2abc/fatakivobizakuwinok.pdfIn PDF document text
    • http://vertinu.lt/ckfinder/userfiles/files/30289548642.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d0dc9680d1f7a0e8ada4cc30a1150ce7/xerajamalodawo.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/70310399338.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210814_45D0A1B6D56675A6.pdfIn PDF document text
    • http://metallpress.ru/files/21602254172.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/tapuda.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608beff5da158---jiporajab.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/sivawegonawe.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/40861723627.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b692283545---nenekubamobuviditaride.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610716c427de0---7307689096.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/4117500497.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/12065039236.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/26816429322.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/57910686438.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23149851381.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/zafekewov.pdfIn 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_off0000bdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCA 16928 bytes
SHA-256: c40ea5e542cb40b9c05963c865eb8ec9c0950b2484a5510551de46d57d185892
font_01_sfnt_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 11384 bytes
SHA-256: 0411ce59fcfcf6e7e92544c1fd4677bdda69ae070bd0a87c22b6bb4a3651e9d0

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