Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4228b5db1dbe42…

MALICIOUS

PDF

86.3 KB Created: 2021-08-07 11:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f39a986df3a0bfc01a6b8a6f06b601ce SHA-1: 41e5fa82fd5aeff2c8d280b5f05d1170ea92e44c SHA-256: bd4228b5db1dbe42fd6d9c0ba575aee3749633728d071f2d3a5138dbe1f6e458
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest it is designed to facilitate phishing or malware distribution, likely via a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=key+avast+free+antivirus PDF link annotation
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16091ce5deed1f---15472420807.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f67bc735c---lenupaxidumabozuzix.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/q7q1t67uu09c8g35bcisgkb3b8/resenorunerelirizoper.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/655811575a90427180b8bba2e130695b/pipalopujiboganamo.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/bodonabe.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2227d882cb---zuzekutokoraneruf.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/61391083322.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/33868047778.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb0cac42c---58720009409.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ocoesfvedu0vqkenvvl9du2s6/69644676834.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/25524015295.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094871eabe85---38408905640.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/tigafivezemupub.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/85058b3b0a6fd377f5b19d0d901ebe7b/tagazutuvisujazotirizi.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/6ffc9231e49c20fe8da980a8486b1b7f/82581624687.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/51328724318.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/50487643616.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/gldgk9tq25smuffl6gp9ra1vj4/fipefamif.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/57458449167.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c469fac9d19---58122122923.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/07vojo2ngfarp18p4kv6t4qhj6/78299733521.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/90014205074.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5db1792b---voxasog.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/85205650430.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_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 10312 bytes
SHA-256: 4a5d92b16c04e3589371c0219b2fc42c532f430ad9f0c3ba816edc67b2424e1a
font_01_sfnt_off0001069c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAE 17072 bytes
SHA-256: ec6e3905316f5cadf766496922dbbbb754df68b6aa0d58b8f2e94a0d1666b8be

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