Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5e11fa445819f8…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 09:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce1fc9a153c93a2bed49fe80dc26a238 SHA-1: f849957e03c6876350a7953e4e519d483270406e SHA-256: bc5e11fa445819f8b23b12b623a1fcf25fa0a13de526cd541951a71d7a0ad31f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to compromised WordPress sites. These URLs are structured as link farms, suggesting an attempt to redirect users to malicious or phishing content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=vba+programming+pdf PDF link annotation
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/2cb5d9f25da78efde7b920e792b2f078/modom.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/zekof.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ea1603814139a6c4c52761c94bc60826/19514185552.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7edbb019---66793446327.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/nizowuwediguxekesa.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/20989286610.pdfIn PDF document text
    • http://net-work.cz/data/file/jijive.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee0aa79561---97336863309.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/pufuzubamubovoli.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58748350364.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6da092693---pufowifiriruba.pdfIn PDF document text
    • https://solturism.ro/images/file/samazogarid.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/66478589595.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/88399566369.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/33cbabef0264f0eb3a53c69211d84ede/73487847848.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/15886886748.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/21df0a2e746caafc8715d8497f6c62a2/87469469143.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/nakepake.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/61902092919.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/19007146998.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/nerogimevuridi.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/rebavosamubupidadin.pdfIn PDF document text
    • http://allycatering.com/userfiles/95107206337.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_off0000bc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1E 10508 bytes
SHA-256: 71eed5d008e8fc339df5b441c200ab84dfbd9c3e3f54798e453119c98849c016
font_01_sfnt_off0000d382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD382 16300 bytes
SHA-256: a26413cfdd126f60a52176092ed88fe2c85538d6a59f6ecdaf15d3c6d8a56770
font_02_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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