Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef351cc180a6c66…

MALICIOUS

PDF

88.8 KB Created: 2021-06-26 05:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6136f7167d7ecf34f5f6628b53b98353 SHA-1: fa054f8e7928f79708228962f19d6b0f00d678c3 SHA-256: 9ef351cc180a6c66ce0963045d2c204540f920ded18964babdb3fc9ba197ace6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/5uqhb8gt8buk0b5r8h5b0rttq2/fagurez.pdf
    • http://nfc.soo.jp/file/11121192028.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/227a534adc5b1ce5f55ccfa81af158ce/bufazerinesesanom.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56535a1d4e---gadujukaji.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/7991617796.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/689d8840b1579028de647c14af1b160b/96666950077.pdf
    • http://henri-ruch.ch/doc_pub/file/66636376810.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/6af345dfqhmnf1dtd1uh9nbpnt/15295616066.pdf
    • http://aceonlinementors.com/userfiles/file/wilovevulivumetozeke.pdf
    • http://birnagarcollege.in/userfiles/file/mukitarugoxuwudisag.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ebe4ba94c---24954425711.pdf
    • https://pass-eco-energies.com/ckfinder/userfiles/files/xejikovoselekazaporivow.pdf
    • http://www.physedu.in/newsite/userfiles/files/57279067126.pdf
    • http://ahcxdq.com/uploads/file/152135547834.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d5a85cb4037c8a457664f8dfcabb0b79/naginobebajavusaroxeno.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ktnjv5b0rsus2vavv6erl3gnrf/18962729759.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/8toqfl9cb6fj16umnhuljnfea3/53037400819.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/51a85be484725562eae5419bae296090/98842593685.pdf
    • https://ceral.pl/ceral/pliki/file/9004274804.pdf
    • https://cuacuonbentre.com/upload/files/91017052616.pdf
    • http://mientaytourist.com/uploads/files/lipav.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b80df1589ba73c9833fc60423a393073/89715061720.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b8cda15d5---5356786769.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a95a51619---rixutajodukakatonukatevav.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dope+haircuts+for+guys
    • 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_off0000fa32.bin
de78b801f2e31ef9765a4fa5270b728366d52c708b23cbb977c1b83ea42bab58
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 10824 bytes
font_01_sfnt_off00011360.bin
ea268534d1f545da16bd8eba6d50bde0874435a2598e3f5bef4425eb9852c53c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 16768 bytes
font_02_sfnt_off00013e52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E52 16792 bytes