Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d44fd371fa99133…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 20:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 051675d8c5a9157e69918df770d1936c SHA-1: d121fef35eb441c2f7d7e57658e8c1f72e798344 SHA-256: 6d44fd371fa991333ffdced73357adc46f95666fe25fea67e878222da9b02bea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=game+offline+today
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304abf04bbb---29755997055.pdf
    • https://keiba-like.biz/js/ckfinder/userfiles/files/fofogodolirokagitezib.pdf
    • http://mijn-nederland.nl/userfiles/file/xokeroxewujebeme.pdf
    • http://chalappuram.com/userfiles/file/radososunikirilolu.pdf
    • http://wohntraumgmbh.at/51218775539.pdf
    • https://soswzgierz.pl/web/uploads/files/nubemeg.pdf
    • http://guanzhuli.com/userfiles/file/92665012649.pdf
    • http://www.tobywells.org/media/fckdir/file/gabulajegetumikujotibabup.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ced57a4a3042238298ad322357be892f/detutepidekizulajeridoga.pdf
    • http://geodavidepini.it/userfiles/files/sofon.pdf
    • https://willes-gb.com/uploads/files/202109090803214498.pdf
    • http://ormansagszive.hu/upload/file/32846789317.pdf
    • http://ncdesign.it/userfiles/files/36682915351.pdf
    • http://simp-q.ru/userfiles/file/68014526389.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/12619590594.pdf
    • http://scard.vn/app/webroot/uploads/files/340279188.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/sotadalaxexakot.pdf
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/gozunezufijur.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/706230a92da3074ee0d8dd77ec99df72/50678344083.pdf
    • http://ufnk.fr/app/webroot/files/file/95649302743.pdf
    • http://euredit-editions.com/userfiles/file/40712578852.pdf
    • http://machulski.com/public/file/tagajaginupup.pdf
    • http://elfast.ru/userfiles/file/ditomize.pdf
    • https://fceresources.com/ckfinder/userfiles/files/3394187971.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_off0000eee4.bin
dbce3d6c87ae9b650690bdd3f043b81cc70f227b739100424946f5ab9531893a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 17168 bytes
font_01_sfnt_off00011b83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 16792 bytes
font_02_sfnt_off0001339a.bin
3019ff9be4218a2bb98e3a618ac9806f8e17ea6d1a0eef51382aa1531b048025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 10400 bytes

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