Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c4242af62f846c…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 12:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0351ec01ee5b97ea669c6410c5bc9359 SHA-1: b310d41df900632c99b952fd0e7d48b04756439d SHA-256: 96c4242af62f846ca0118ed9e47d0ae9eafdd71acd044001c93d8a89946b9994
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://autodilykanka.cz/cmsimple/images/file/kobisisalixenuxonimar.pdf In PDF document text
    • http://evo-models.com/uploads/userfiles/files/delodajok.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/57638170323.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/fovoloxapagozu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b370dcfadccfc4c73e44d3340f91b0fc/10691548788.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfae679308---gukejevixufovigota.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/gewoduledajo.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210902060846_127332.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/wituwatejetegareriz.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/zugagukuzugilagoru.pdfIn PDF document text
    • http://www.siposferenc.hu/html/bolilowapefotid.pdfIn PDF document text
    • http://minipit.com/data/files/21250296147.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/54307959236.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/pewivovuvozena.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/wewudaxigitakomigupog.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/gitezopo.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/degatimibugigemuluxo.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16144152252d32---54287304966.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/zenavemenetafa.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/99324422611.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143e05b5f282---sujedikilif.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c862ff96---rasoditasuboparisoj.pdfIn PDF document text
    • http://zuche0551.com/upload/file/20302167389.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/batukabegiluximukeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=my+talking+tom+old+version+apkPDF 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_off0000b0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F8 15624 bytes
SHA-256: a7541ab09a26ff3eb3a27c9ad0df9cbad03ea7b14a9fd8c9434231285bff0d74
font_01_sfnt_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 11000 bytes
SHA-256: 62f583f269d0e7a14c2b64e9806a70f07ba622a2a9ecd0f937e623fb1e506649