Malicious PDF — malware analysis report

Static analysis result for SHA-256 645c03d26e7066bc…

MALICIOUS

PDF

70.9 KB Created: 2021-09-10 03:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b8141921c7335556e2372fe3ca319efe SHA-1: d25be4312881ced8bb9cda457d4897f4da151942 SHA-256: 645c03d26e7066bc3e1a54dc82525941e4ff674184336576617a18c68cc0014e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on various domains, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://ikkosushi.com/uploads/files/zovexebowusowapab.pdf In PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/dijubokawep.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/62892819096.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/zoripit.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb139830f---vomari.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/zukudokapake.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210903101529.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/40830276320.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/ruvoxunalexiva.pdfIn PDF document text
    • http://njchemland.com/upload/files/48025569074.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c2ab2cc8---volebexa.pdfIn PDF document text
    • https://vgcanada.com/userfiles/file/nubuko.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/51856223800.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/57259388436.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/57702629601.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/57424326877.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/d270936801b80fd3542054453ae06460/rerulukejovitamigugega.pdfIn PDF document text
    • http://acril.ru/ufiles/files/rimatofagajeki.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/jigixejevipejejujulifewik.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/zegufewir.pdfIn PDF document text
    • http://uco-kampen.com/media/files/14656557825.pdfIn PDF document text
    • http://bitree.ru/ckfinder/userfiles/files/selidilixemavuto.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161372640d13a3---47464475309.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/55782610840.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/takenewinupetizu.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/xejoduxurop.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/70461516371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=xperia+xa1+custom+romPDF link annotation
    • 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_off0000b6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F3 10648 bytes
SHA-256: 3f2ff5dc958444c4dafed0fc13354b0cfb90f0f575b4c82587a6b24dd4398bda
font_01_sfnt_off0000cf69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF69 15176 bytes
SHA-256: 79ade60b64e2e8e16ded33cac5383cc6ba0a1ef8e8cbaded6d1f27da222a40be
font_02_sfnt_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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