Malicious PDF — malware analysis report

Static analysis result for SHA-256 9345a5bb86e75c12…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 01:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf4bc979f7719e1016f15bb0060f5d2d SHA-1: 1e7102ba4b5f38d06198f23add7fb55ba85ff2f4 SHA-256: 9345a5bb86e75c128b4981240121f0cf3c6ae679cd35fbd07c609728817e5209
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=soy+saludable+pdf+gratis PDF link annotation
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/49733e0c5a1e4f3db29583830aea8162/ladotinanufawazinomipiwip.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/3110582687.pdfIn PDF document text
    • http://k1a.ru/images/files/file/jiwisigikodatoruj.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/vetunazimukawuxil.pdfIn PDF document text
    • http://belloverde.net/emailer/file/51123333689.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/bexakojali.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/48684868962.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/kixozupatejagajapux.pdfIn PDF document text
    • https://xistenze.com/files/files/43173213634.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215191242224882.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/xototirupavitimi.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/70845724770.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5649118e6cb7560264efc60601e563b0/36642097762.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/4671258327.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/86475881770.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/zidegofusasuxepukupumivuk.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844fb03f7c1---36334776281.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cbc6ea2a4---79360062147.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/kufojabokataferaba.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d9f06e51e---fudukopi.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/vexevepoxowupotuzo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2e56ad4022703ecb1229a508e3bda211/98079853926.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/0955b1d04103ad67a7580fc3d6460b97/60456525450.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_off0000c761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC761 18464 bytes
SHA-256: 436ceb942bcbcb5803871a7cdcbb20a28d264bd40be7840d6b4dc246bf916496
font_01_sfnt_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 11000 bytes
SHA-256: 5c39ecda2a5cdd8a43fefc3ba440c30c26e5a0502a94ba48cc7e3ba9b0e0c153

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