Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e3a484eef397f7…

MALICIOUS

PDF

85.7 KB Created: 2021-08-17 20:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3cb8879d6d0dfe610b0e7ad60cb85e4 SHA-1: b1a6bd320421df6e8da8af69fa62c8d948bb7702 SHA-256: 28e3a484eef397f737082caebed0446640ded955d4cb83dc3a6f4cc2aa3ef260
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wastran.ru/uplcv?utm_term=c%C3%A1ch+h%E1%BA%A1n+ch%E1%BA%BF+ng%C6%B0%E1%BB%9Di+xem+album+%E1%BA%A3nh+tr%C3%AAn+facebook PDF link annotation
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe6769e30---domitemusiwojanatoves.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/76706637913.pdfIn PDF document text
    • https://artbynela.com/uploads/file/61159235538.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f10ae1d320---75812940714.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9668f14acdd3c4cf64d97327e5df800f/mabasomu.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/josolitopumetugo.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/7951007123.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076321d14353---tivevexipadosimus.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161122eaf0e0a0---31673674071.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/90836676244.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/wabafowiru.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/7bc2a5bbe05afde28ec7eb74deb6d172/37015039676.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/11061617861.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c666118eb7---35358561645.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b7d6bf7b---luzogumi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc690e0fe7---nosuziterezemozida.pdfPDF link annotation
    • https://monyetmesum.com/contents/files/31203899364.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a59afdf2b46aa4f58ac9488a67fe89a1/bevenazigibuxutokumaxovu.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/67763695523.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210702_BD30AA119C4B0C6D.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ff159ce9b---zonagonujebo.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_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 28936 bytes
SHA-256: 90fe058614ca581aaa896a5bd14e3294a65b6e4c12cabeed76d4219e8cf5c997
font_01_sfnt_off000112fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B14 12440 bytes
SHA-256: 4e1981418d86845ef099059bc1bafcc28359512dd2e355b3ccb11e5115da9598

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