Malicious PDF — malware analysis report

Static analysis result for SHA-256 05159aa738a273e1…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 19:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe73ce9e8bcb4c746b47b2a13454e1b8 SHA-1: a8d354de8b56a404fb8de45c1e89d6cc998f1ea5 SHA-256: 05159aa738a273e1a89e14f98134ca39d0a8c9548d48055081e2dbbbf6d1c040
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to PDF files hosted on various domains, suggesting a link farm designed to distribute malware or conduct phishing. The presence of external URI heuristics and compromised CMS upload links further supports this, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://verlauf-ekb.ru/admin/ckfinder/userfiles/files/23586816982.pdf In PDF document text
    • http://attlas.center/userfiles/file/54441676551.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/ninozusoguvozijepexes.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/b622ea8f22b3dd86383cbe72eae14ac2/63211932735.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2891f921---90641833333.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a2208956---43052032402.pdfIn PDF document text
    • http://panteres.com/files/files/56016806698.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/lilifurevugu.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/22168438492.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/tepudaxuv.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/52833729124.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/pufujedisa.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/xofasimewuvosawusom.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/60545602589.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/xejoxabugabufitikubobineb.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/56822027519.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jhr6jaoou8u74p5vf7e0n4pjj0/dipulizurizesafab.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/42201102714.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/lidowagumixoxomum.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/libilebejiwolalaw.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613427f37f2e3---gadifuparafizusov.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/nisisagenapago.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/37144206595.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/fokotamadem.pdfIn PDF document text
    • http://topp.pl/_topp/file/42854907946.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/zoduvojodu.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/kivuwudepotiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=klm+anatomy+pdf+free+downloadPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 17940 bytes
SHA-256: a76d26eac656381b34bfc554ffd7bb479db917da978a54e8852db4c38551cdd4
font_01_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 10592 bytes
SHA-256: af549c1b61e114997d3a391cec0a87c03606bb7ae6eccbe0180b2562edefa8e7
font_02_sfnt_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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