Malicious PDF — malware analysis report

Static analysis result for SHA-256 7684477c33c844bf…

MALICIOUS

PDF

89.6 KB Created: 2021-07-02 11:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 201adabfdc46f0b4cf90cd8d3ae96da1 SHA-1: 492b382c2aa5a9fcbf36acf08c0f46c4e898c308 SHA-256: 7684477c33c844bfe21ba64efc9d9644ef90f96244b203b5ac2d3aa8072cfdd9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of links, many pointing to compromised WordPress sites. This suggests the document is designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://m-co.de/wp-content/plugins/super-forms/uploads/php/files/1fa3tp1dntea23t4dmmp1un97q/94915348096.pdf
    • http://bafiti.com/sklep/userfiles/file/57670488420.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c77cd4f2df4---gavifobemojubomixaxo.pdf
    • http://picassogift.com/Uploadfiles/files/tadajagulitixel.pdf
    • https://codecs.ro/images/file/nafakeriniso.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f00c7c34b---44185343854.pdf
    • https://implant-drill.com/userfiles/file/webaj.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b831a576---vokezolupikaselaxugagefu.pdf
    • http://epoch-making.jp/js/upload/files/pobofixavasorir.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5adac0ffe63550094d34035355f9f5cb/52676397937.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0cafb7539---numubudirurepipinezo.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/vipamutogiru.pdf
    • https://nevisnews.com/userfiles/maxelonu.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/9836f9d5c1364b998f7e4262e772c576/97193887028.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b152f1dde---71843137502.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7rhp2s5behm83i11o0sts0darg/buwomowabajiganeg.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/jivewexizozoxedep.pdf
    • http://ridendo.cz/files/file/18007667068.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/p8lqbf68fuj92gk2fc473chcr8/82390332077.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3797ce61---rerulupuxel.pdf
    • http://clairerolo.com/userfiles/file/dupumalowetimejon.pdf
    • http://stellamaris.cz/userfiles/8636054668.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5a3de696---24051860945.pdf
    • http://andrewsexes.org/clients/867461/File/80423156838.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=thank+you+for+your+usual+support
    • 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_off0000ffeb.bin
2171b00643e361904f27fe7a09b07fd74366a4c92a0723e922f3d3505a720034
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 16340 bytes
font_01_sfnt_off00012a3c.bin
becf296cc034df950d0b0f44dc3ada9c5b447773e758b2053120a45e0a435cfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3C 10500 bytes
font_02_sfnt_off0001421e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1421E 16792 bytes