Malicious PDF — malware analysis report

Static analysis result for SHA-256 6004b56cace39e61…

MALICIOUS

PDF

119.5 KB Created: 2021-07-25 12:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4bef839275f3517f902859f6a7e93914 SHA-1: 0c1acb5104bf3b6668429449b9aba6f31092b3ed SHA-256: 6004b56cace39e612a20b5d384708a9cb725744baa6f9274b07bd90f3cfd4c95
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's used to deliver a secondary payload or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b17c8e8f56---wuloxetosaguzatizesite.pdf In PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab27ff75fa3---66843671400.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/3ar2kgt73qudiukdu3tqgbv9ij/66662123649.pdfIn PDF document text
    • http://heizler.hu/files/file/87326596110.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/e8a6e15e6808b9f62dd372949a6a0364/pemipotaxixoz.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/8292abkqgj7fugac00686mf6mr/ragetikufetipulas.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/koxilefipeligerut.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092315dac40f---42082708547.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfa98a501---zomupaxanop.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b425ae3ef7a---27959329380.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/36789565331.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a9daa2d65---75108784231.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/tpnknkrt1qr2grlfvqclccub4r/70734338238.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/miruxitorugimonerumurazin.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3c7c604cd---beredokara.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/83539607792.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/jatageza.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160759ca7eb864---lolifu.pdfIn PDF document text
    • http://dejede.com/userfiles/file/logubirukifefazobasobel.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/96qfvdkp2bnef96tdes66lp655/76398382500.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/tivip.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759607ef84b---30764616585.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/13924398869.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/dulik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=actividades+de+artes+para+secundaria+segundo+gradoPDF 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_off00016ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EC8 18580 bytes
SHA-256: 736ee23046865c54519ec40d40cea1316a9dc9482365c3a412b6352f93430695
font_01_sfnt_off00019e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E72 10788 bytes
SHA-256: 8b69c549815d0468cc8776d1685f30d0bb71feb6f7cec34fa05b66a15a366423
font_02_sfnt_off0001b73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B73F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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