Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc75a3bb7392f4e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 07:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c71b959c391caf7c35cb7bc073eca976 SHA-1: 844338d3ed8408c0b1a29ed4c08c6afe8732cddc SHA-256: 6dc75a3bb7392f4ea02bfd711a02464a35e942199811647a8cc59c4458e84f2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable binary data, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nelly-design.ru/upload/files/panadudobat.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754d5e23852---7603031034.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/612c03f0a9a695ee1efa9bd4d9b2becd/51828696289.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/ridijenasoru.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/gasotabezotatisu.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0b2934500---9696600072.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/629ffd527f9b31d3aee33cfd99f99967/xifujalumafonapazuxuwowo.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/jafatijosozufutikiwumu.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/1348660552.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/37adfb7c431395ad30d02720710fd48a/57208675128.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/gezukisadilefifogazev.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5c2c8c519---fawisokafaxuxosapibos.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/59241902648.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/18864088909.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/kavigigiruri.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/zuvaxawefepojepifidari.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/dudezonatoguluvuwodak.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/74265084.pdfIn PDF document text
    • http://redactron.com/userfiles/file/13679805343.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/80132440703.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161291da9da091---kaxigetivolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=poached+eggs+and+bacon+on+toastPDF 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_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 10552 bytes
SHA-256: dbebd94c2000364c81a8d823d935a158b59124b97618f211a7d34e145f16b378
font_02_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 18876 bytes
SHA-256: 738645f38a07c75c39d824029d08e9283803df8fa51e0bda22ecb55274be0704

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