Malicious PDF — malware analysis report

Static analysis result for SHA-256 78da58222e33abc9…

MALICIOUS

PDF

88.9 KB Created: 2021-07-06 01:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 699cd65d4824c740dc6b09d34c96a431 SHA-1: ab5a72986457126403196e700a978495b6d7ee12 SHA-256: 78da58222e33abc9bcbd1aa8171a2382686c90aacac96676dd7b3ee650a39117
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS uploads indicates an attempt to leverage these sites for distributing further payloads or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=candied+fruit+similar+foods PDF link annotation
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160990e51daaad---44413820525.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/jonulej.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092d61cb87ee---foborudexawamakuwusawina.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9d921cd9dbd61d54ef1bdd788f17a19a/49374157832.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b9bc44cbe69dca81e27708204a07930d/80286679529.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/27441607129.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/9624f4cdcd5c79550e0405424c204157/kofodu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6293b7edc---8976740724.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925ae491c4e---5876976542.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c120e2c6b00---nixovurupi.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5a781da6---31748906333.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/buxuto.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/butazafarotazebuvusirug.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/845b356451fe239aa72e529fc4e7cc88/monowebogurutefi.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/9849frph80q21r988gb12p3an5/talibex.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/fomoxir.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/316627581ce5a3cd3fdbe9d549da9ab8/sivifu.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/rinumewotedewa.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b984f5df0272e42756e0aa076af0578f/wevowoditamunelotisorabut.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/rumiketenewosom.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c431dd5308---xevaveruxatamegami.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/70578759541.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/62cacd41faff1ed77261beeda2d6684d/84179627171.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 10648 bytes
SHA-256: d3441de80badf6d266350517cb06f41de49fd1a4b27e3106663bea1a536d91b8
font_01_sfnt_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 20668 bytes
SHA-256: f2f562358f638dcace63f41b4f45050681a6bbc682c0bd08014c5b195739d0a7
font_02_sfnt_off00013cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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