Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ab611ef7190208…

MALICIOUS

PDF

78.7 KB Created: 2021-07-05 13:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2ba03e1bafb52da1c53a964e13d4e17e SHA-1: 9b8ec69f9cb5ee920c0bac182814070f09a6c88d SHA-256: a0ab611ef7190208a96b28b762ccdcc12264e4d51a6981f50044cbce4919def5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The presence of embedded URLs and the nature of the link farm indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/77411275229.pdf In PDF document text
    • https://lesura.net/userfiles/file/94898059732.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3791a44626---62083557800.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7ofvs11nu2i8skdpbalavcnpna/dipoliponidabujozoxok.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ad6197259---jolip.pdfIn PDF document text
    • http://coffee33.ru/archive/file/39306411070.pdfIn PDF document text
    • https://triosms.com/userfiles/file/90014398035.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608082e73a816---76787222647.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868fdac7968---rokenutoxuzewudesebujivi.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/zobikupujiredede.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b0e42a4c8732918af0bcf1a7011d7c15/rowiluxuxa.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096fc9428d2b---pojelinasoned.pdfIn PDF document text
    • http://dgjst.com/upfile/file/jejaneneko.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/86869812181.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210617134617_zxolrp.pdfIn PDF document text
    • http://flexa.cz/docs/file/75764822893.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/979a9b2a4c23b4b181bff10725f5ccf3/tejaxe.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608578c2a3833---18158256934.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/33736992214.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/545a83ca2bcefa7a5679db3e2a83da0f/26606098629.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/45400239064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=as+sure+as+similePDF 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_off0000d395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 16996 bytes
SHA-256: fbfead3cdca9d7b15d18cb7a2a88225ca5d067f459911dcab595439e4989f767
font_01_sfnt_off0000ffa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 10028 bytes
SHA-256: 84bd7b46757c1d2b19e5312584a332ff0df33ced95f46d7463896c64c08f862f
font_02_sfnt_off000115eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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