Malicious PDF — malware analysis report

Static analysis result for SHA-256 6678841021b9928f…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 09:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4c618240a199d4f22b7ac42af13de92 SHA-1: 08cf4da7c557a138460113fefe1e16e30cbfeb07 SHA-256: 6678841021b9928faeb196be1d9b252573007f4740cf6e738bbf422745139c5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, with several heuristics indicating it functions as a link farm hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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 http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gudasezelumijefebeninugad.pdf In PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/90312407713.pdfIn PDF document text
    • http://maksimetall.ru/files/xiwedodusevazukovizurov.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c020645d---36528442147.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1603944715611bc7c8a70f8.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/xudonet.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/lupiwonojozow.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079725601d30---nateletiguri.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/i6gnrce23ru363q9m5iltku0g6/vafosun.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/945cb93299c3801589fd7711d5c56f82/66204777818.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ee5222ad1---51218696159.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/41ac3adef6585f00414eaa1c79bdfa82/99476086212.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/57236181893.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/wobabipege.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-23/20210723150719756764.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/xukigagoxesotepet.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607063d5595f1---moror.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/82455077913.pdfIn PDF document text
    • https://banghenails.com/upload/file/21038319328.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/21305147329.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/64547519529.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/vavogaxubilinepusapezumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hospital+pharmacy+pdf+notesPDF 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_off0000c3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 10988 bytes
SHA-256: 104b76ae059a4246e7f3cc72fd1a9351132559b16799dc5ac6fb4600ccbca4a6
font_02_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16624 bytes
SHA-256: 4e72e1d66516e8ea120809c0e1ff1a611d8814bf67acec99f8cc4db2935e4197

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