Malicious PDF — malware analysis report

Static analysis result for SHA-256 669c0f3480e70245…

MALICIOUS

PDF

70.5 KB Created: 2021-09-04 02:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18d8165dac5e0a7e46924f103fca2745 SHA-1: a14f58df671fb0b0be7fbd41e4e3dea7a0f94d44 SHA-256: 669c0f3480e702450636bdce8134bde79fbd1f001158c60d136dae66812fb6f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, likely serving as a lure to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://drafthe.ru/uplcv?utm_term=philips+lighting+price+list+2017+pdf PDF link annotation
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/40307629209.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078665b26d20---tadazatajevimininuwizuz.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/nezoxerajarowubixeb.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/dc5b5c5dc318bb4a065555c1b1424ac1/fogevakulugusozag.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/74623468395.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b201e438---25787712750.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fae35a369---46353692050.pdfIn PDF document text
    • https://quaint-house.com/karovobewexadavorijokulu.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/vozejagi.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/e63228845ab1741831d4393e472d9290/jalizamutizow.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/616d8e2bce8af52b5f447c0fc667b1d7/49819983951.pdfIn PDF document text
    • http://sro52.ru/uploads/files/22382917221.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/9e599314daa09931ae5382d16a032325/19441863247.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/7bedubqre7p40db9ma33d8bou5/2090979233.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d38e6c445---sifeke.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/99796232912.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210818_AF13E949AD933CAB.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160899a6e8f2d9---tejegumazekasu.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/lawisikokekev.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/69002672326.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/642560319.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/73801103623.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/ravira.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161048e55be4c1---mawivuxezuto.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7ca886d4d---bipiramekewakidunidarune.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_off0000b50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50B 10964 bytes
SHA-256: 8d4598ea79dbfdbe34132245e345bbc232292e2cfb710c9648c70dbfc06ba202
font_01_sfnt_off0000ce4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 15096 bytes
SHA-256: e5bd06c4685fceca1e1f54e2eef0a2650159e48ad39a4c2fed588cac6884b72e
font_02_sfnt_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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