Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b299927f637636…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 13:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 904558b8b903f5689aa8c57d2d89827f SHA-1: f64a295f9095a0fd5d45f901e83e7256712ce116 SHA-256: e2b299927f637636695f47e521d6a55c43213a181337a15f4e83cc6e94835c87
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms hosted on potentially disposable domains or compromised CMS upload directories. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=roohi+movie+download+1080p PDF link annotation
    • http://usmleworkout.com/files/file/97399557526.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413f11c2e67---78375720451.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36817457690.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/56892704113.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/69331259240.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/79188399557.pdfIn PDF document text
    • http://labonscafe.com/userfiles/siriwivofexomegolisodu.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/togap.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/31224048631.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/bidawurexogugozivexawal.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/032ehr6ijsbnhherdno3fcj9f6/gulukizuvo.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/resupajavirafepo.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/98436431812.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/6695058368.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ronibajikazelaba.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/80059339576.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/21306427933.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/foxazilozatiluveme.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/pejesukopuzitowawasozup.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/tisezawigub.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/vivemisatuvufurapugutuwit.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/72022774586.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/sexinezap.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ngnon7q0hfmoj2eh42mjpessrj/mopurifafe.pdfIn PDF document text
    • http://fruitsad.pl/images/file/nuvemaforodojadavi.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_off0000dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC46 10872 bytes
SHA-256: cb043461b8288289d5721331b12032aa82d71c5805b1ed4d0b0eed3737601dcf
font_01_sfnt_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 18796 bytes
SHA-256: 04a531abe34b03aec1d743181f85d3c402ffa0f22334d1bf043c8e76d2dfe6a2