Malicious PDF — malware analysis report

Static analysis result for SHA-256 4101aeb2f66f899d…

MALICIOUS

PDF

96.0 KB Created: 2021-06-26 17:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34d6d68a9fb5a8e79c690a02d4e58301 SHA-1: 12cdc071821ee3b9c5298c9dbf326b4cebb19d41 SHA-256: 4101aeb2f66f899dde9d3acb1d38d9aad56f7dbbeada0ab828cfbc2b7f323844
164 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports a malicious intent to trick users into downloading further content. ClamAV detection and ML classification confirm the malicious nature of the file, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=free+sales+and+marketing+policies+and+procedures+manual
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d614a062c---todagajiminevazi.pdf
    • http://www.toeterloeh44.de/files/mibapiret.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092112f44fb3---74600496757.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d36ec1d8150---bezozoxukunilapabov.pdf
    • http://buddhavehicle.com/userfiles/file/97604748915.pdf
    • https://harkakotony.hu/UserFiles/file/jefigixifugofuzizafumil.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607800e5ab288---bipunagugusizafolugamepo.pdf
    • http://shengnabei.com/uploadfile/file///2021062306021074.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a346fc39a32---paruxevirajarunokebabo.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/224cce00bfed59025a7b2edd72ebc363/66447103031.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160797750c1777---notazeroravaraboreze.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/lezurejopepon.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cbba227cb0050ccf091a604d37f9aa84/68299629007.pdf
    • http://www.deewanalarab.com/up_imgs/kuwobakofixuwibo.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/0d417d3ceaaa60b3f28cc02ca14d4964/wuserevogajaxuvopefenupab.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079b16bade4e---risefezopemimodubetutiz.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5fc67ca14---57750442704.pdf
    • http://gabortech.com/admin/file/59193905921.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83994992aa---264248958.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/3116a0c4628ce24da7a56bf8b4d6f8b3/videvuralifajenu.pdf
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/togedarew.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/f7ec3c83b7b709e9a3f95d48cbd84fa0/5891080374.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb57ba241---37419854491.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0135baf04---89002935037.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f69c8081ddb9e5975713b3a14d507021/96587965711.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/29518247659.pdf
    • 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_off000111cc.bin
000f0463617671b9f7bc17514b0f086441a1682a16d76d4c5ac12def0070472d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 17948 bytes
font_01_sfnt_off00014040.bin
7fc2dc6bcaa9fbc3be548b85f26469791a1357fb8ce4d42397109b11f78db862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14040 11024 bytes
font_02_sfnt_off000159a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159A9 16792 bytes

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