Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fc87f941c4bec3…

MALICIOUS

PDF

71.7 KB Created: 2021-09-07 16:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b33c015479e08659169dd564d40bd0d4 SHA-1: db11a73e6e4725f1d18ac18c6c75935b2aa11e59 SHA-256: b5fc87f941c4bec3a9e8fd18290ce82081d91d10afc5c1542334a32194b6a939
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous links pointing to compromised websites and link farms hosted on disposable domains, suggesting a phishing or malware distribution scheme. The file's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, which aligns with the observed link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=english+grammar+worksheet+year+2 PDF link annotation
    • http://capitaldanceacademy.com/userfiles/files/lujapiwojuruw.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/xuvanu.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/v56pucmogqkhub73o7q90gem2g/89374007493.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/fitowuvadijuvakobav.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/65a73635c1b63a6c5a611b7e8b580b8a/teroj.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/87927923335.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/dinemerujafarij.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/luxefediso.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/00811b72f2819115bd7a754a228c5b7a/tiziwotiduzima.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f40c2ae0ac4b0c512c318cb007196d8a/buresun.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/47464579495.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gcb3fhv3lb9qbhmccioh6tu7u2/35454648008.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/97149406688.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f9543545a---lozirepididaju.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/pizopoxorememe.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/pazulasarilupunin.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d91b2480697---subilitagitezojilutivuko.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f790458a8d---vexiz.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/85021c9bd1828a32ac5121f37d8b7b83/44641584452.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/piporedelakagesosobovisim.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30ba7b5b93---33869010563.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608219d17f0cd---49440877671.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607461a416b7f---fododuximinonovedebis.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/68209548942.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/a1ffb3915753c934945b5425eb16fe22/dukemelavowirivupid.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_off0000b86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86E 15560 bytes
SHA-256: 34534eba6a44a530a2f780d090bb29e0ef19e7de2c3ae923fac3d0d35a153c4d
font_01_sfnt_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 10948 bytes
SHA-256: b2853119c70595e9d7349208eb226667c6c7f52ad2f463b732e87041285ffbf5
font_02_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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