Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b10859d1efc186…

MALICIOUS

PDF

94.7 KB Created: 2021-09-17 06:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04da4b49b4c74eda8a48b69164bd6a53 SHA-1: 54abc3fe2275088b1d5cfab178140d684b116550 SHA-256: 65b10859d1efc18626a15780148206c15f6c6fbb5079f08a4eb49038116ca201
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites and using UTM parameters, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://nomylo.ru/uplcv?utm_term=naruto+shippuden+233 PDF link annotation
    • http://newshop.jp/archive/file/vokilidonemonatad.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/72362096193.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02adaf409---buwodezodipu.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/lijukewemuzanenutisidir.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e12204721e---99410248918.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/noripi.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/mijizanopexusetuberugativ.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/xopelubozado.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336cbc248ad---lenepu.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/filepufep.pdfIn PDF document text
    • https://clinicscrm.com/img/files/polalopep.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/84326308727.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///89870081934.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/121407409415.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/sadowojep.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/dobarupusivebujikaw.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/9473232695.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9f93ebf3---29181249598.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///28714545423.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d8a134762---rozefi.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/dufuboretoxafelenisuv.pdfIn PDF document text
    • http://getdol.com/page_data/file/85347974690.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/dukotobizosuvukekila.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_off0001015d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11974 10812 bytes
SHA-256: 1fe09eb78b8d5139c26111b611515db29de9738337fa543637185f3eeb4d4f22
font_02_sfnt_off00013269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13269 22536 bytes
SHA-256: a95dda59b43b24f8db58300b5c65524565d6d9d8d7e5a55c16977741c49119d7

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