Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6165397fcd98ac…

MALICIOUS

PDF

107.2 KB Created: 2021-07-19 20:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 11199f21f846de332276108431bb679f SHA-1: 64df1f95913d1574a0314bcdb4361a4ce67c61f9 SHA-256: bd6165397fcd98aceac732409e9414e1587c8abb2eb080eecdd0bafdd5ae04e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it is used to host or redirect to malicious content. The presence of JavaScript indicates an attempt to execute code, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://yournew.site/wp-content/plugins/super-forms/uploads/php/files/el3jmbv28pa80vuqvsu57jcmve/jadefevafifu.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5cc6f8cb8d06046badfc5c2fca07cbcc/dutowupajutuduwigeme.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c188abe44bb75d5a5b8f9498b30843e8/61889992424.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/68a460aa52d870d95ca5df082edcf33a/59699960258.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609079c8132fc---kegixosomotexopoj.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5d679382a---guzodok.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0368dc3e4fb161d1a5372bc96bfbde68/12811716150.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92520fe41---gawufuroda.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gamapupip.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8495966f0206cc10d1944452f1f57c08/jotemebog.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46937826a8---vaxegokedugedo.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/7004be90c1f75154a0f2fca84eb34f16/92494321562.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e59b85dc6d86bcddd55620df94cbb459/kugut.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/58119906257.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da92818b73f---39297785646.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070c4b3a63e5---96837385508.pdfIn PDF document text
    • https://serka.com/serka/upload/files/46081031239.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/lavupalifuriwudufeti.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f9258c021100485c3f6abff6a17ceb62/8109173370.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/54044191142.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/59bc8dc725de70ba2405499aa8286f23/javerefovara.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/139mu6tk0s1c8subnet2f3ovqr/sijijamekusarobaferurene.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/tinikufesegegenezapegun.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/bdcd0d8ad8bbfd157b0fabafe23cbc2d/49470444997.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6p62cm1f2nbhu4llls6gk6fa21/wesomipusedimezinixumof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+see+other+people%27s+friends+on+snapchatPDF link annotation
    • 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_off00013b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B22 18448 bytes
SHA-256: 492161bc8bc19cc57c97ee5b8b15f87741a7139d4b372c8cded2a5312145b576
font_01_sfnt_off00016b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18370 11040 bytes
SHA-256: 6068220ad4e07dce1cf6fc5af59fb57aab09d26df031b31c1f5cfdf7672c92d0

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