Malicious PDF — malware analysis report

Static analysis result for SHA-256 a371d0c7d0d29432…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 14:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7fbd195e9074e4712f2a563492e6b557 SHA-1: 0c616982c41c85a95fc6f1b8aae006875533ddbc SHA-256: a371d0c7d0d294321cbb47f868e6c1fb0be7d7c4e2e3e5805ad7c1c2e872adc2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=the+artist%27s+way+full+book+pdf+free PDF link annotation
    • http://detskypohar.cz/upload/file/doriw.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/zaxamozikuxode.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/82079697372.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631514097.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/69470212005.pdfIn PDF document text
    • http://yibetter.com/data/files/62600615843.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613151d88946a---dijajebitos.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/46912835948.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/litofozemifazufizazitas.pdfIn PDF document text
    • http://art-ball.net/files/file/49242094793.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139348db6368---19201348787.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3cb093572---81862282617.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/xezopuvafadexazadasidef.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/widururi.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/16071199665.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/tigefu.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/gazakevevoset.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/22755961474.pdfIn PDF document text
    • http://watfordfairtrade.org/app/webroot/img/files/kavujajadominibosetat.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/buvapakugogojerigibuj.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/taxefosep.pdfIn PDF document text
    • http://dges.in/userfiles/file/rakexe.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/gogasikakutebini.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/18482579480.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/ligelaxukamofilaked.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/26523014837.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_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 11020 bytes
SHA-256: 7ff449d3a4bfa9263c4ddec56015399c16696e6531a2403f68525240dbd66ad3
font_02_sfnt_off00011297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11297 17500 bytes
SHA-256: a92bca6f05da3a60a0ba6d966b3273af8ababf3e2936ef4cda82f4915d9e7403

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