Malicious PDF — malware analysis report

Static analysis result for SHA-256 960618beef8f3ae6…

MALICIOUS

PDF

87.4 KB Created: 2021-08-09 22:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76a74f49ce5a7936afaab0ad90bab7d3 SHA-1: 01edb37858b67e84e38558befba0da53ceb6c204 SHA-256: 960618beef8f3ae69d2bf2eb6fc12e4597925782db1514cd3313cc5c7b080dd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of many external links is the primary indicator of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://irlanc.ru/uplcv?utm_term=imagenes+del+cerebro+para+pintar PDF link annotation
    • https://bawwabatrizq.com/userfiles/file/31865680786.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/r6t80vdnntd52oa0sl63vbqogc/98687585481.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/zuxolofolivotajivevukokuj.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/vufumalejegonomelanofabaf.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/4b3c0280096ce4861ce08b455cf6f026/nozoxokemiwixipefapuzib.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/0ra0ejthi089sbe7hdc0c4ac5f/30664153488.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073142e2a172---92276767779.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cb9e4ae69---kafev.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/dufola.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/dobod.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/15695522892.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077187b6534d---gapubinajurid.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/dbfa359e1e76263cbd48ddab23757938/55387725870.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/jasunininox.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/judesudum.pdfIn PDF document text
    • http://iworking.vn/uploads/files/22346914207.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/2673b59dc63d3bc559aff400b34f5baf/29044117703.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/825444210c3682d1fade34918957ae16/jidizi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e71edd634---38311153907.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/5c60755547c8c861998acd1225278122/27717566290.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/zulemikafubulewejoreras.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/23096193393.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_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 17504 bytes
SHA-256: 9085f0671777dd75a462ed7f64a75c30a7afe170014726bc7dcc718d225d5c9e
font_01_sfnt_off00011c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001349f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 10948 bytes
SHA-256: 2cd7343697de2e1a078deb1268becc21b7e4502113bf105e0e78d606271f1990

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