Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6389b8b549a7a33…

MALICIOUS

PDF

103.2 KB Created: 2021-07-02 12:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 960c3b129797bd6fad0ef70ad46b4966 SHA-1: 479c308a9404db30f2d0fabb67e3a16d5fa4759f SHA-256: b6389b8b549a7a333ac917aa6624d021952fb1fed119d80f5dd4b0b3c099d093
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation or to distribute further malicious content, making the primary attack pattern a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9830

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://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/bokuvebat.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5b7e2d34d75dfa860ce84c2fc95eaa5/12196759942.pdf
    • https://vansuloi.com/uploads/userfiles/file/64165085001.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a0732e1d2---ravatagibafuxanulas.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9f0554970dd0d50663c61ab1f4271a6c/lekomefogibaminelubaja.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ddc435538d0745f4c8c57b5b1842484a/jegenukonejararopipef.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a22d5559---42506605340.pdf
    • http://osc-pribor.ru/products_pictures/file/69462936979.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/acbbe255b6f708e774e7f0f3c9db1bec/9424335640.pdf
    • https://alakharia.com/public_html/userfiles/file/kusogolozejejunikuzowotu.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4a1b2dde7---82071095142.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/958e4235e7757ea48e8644a74fb5bd5f/28837454026.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/loq3uhcrinmkqsab3jjg22afr5/40495062440.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c930aa1842---puvuvoxefidemogilutup.pdf
    • http://koryosushi.com/uploads/files/23847275954.pdf
    • http://ackerviewguesthouse.com/userfiles/file/14505261504.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/bba5d8dca024921b10c58d580fed1e3c/3645032847.pdf
    • http://aarogyamedico.com/userfiles/file/59489782168.pdf
    • https://bbpartner.cz/userfiles/file/14682441885.pdf
    • https://xanbiente.de/userfiles/file/ramip.pdf
    • https://srilangkapools.com/contents//files/kozofusudajeji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+you+spell+grandpa+in+polish
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 16792 bytes
font_01_sfnt_off00012105.bin
659240b857f76c639e279f592ef67dc2fa599da59722546a6a62fa8724dcc307
pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 2208 bytes
font_02_sfnt_off00012ae7.bin
6f2e39523559a3d7fd291807ba2ef2fd713d6bc6001f9717c43944617db17c4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE7 16876 bytes
font_03_sfnt_off0001433c.bin
dd014d047f72e294988915482583f676de4bbb712bbc7a7e010c0d9718bd9096
pdf-font-stream PDF embedded font (sfnt) at offset 0x1433C 19832 bytes
font_04_sfnt_off000175c9.bin
5d696fe73761c56546cb8832099afdb870141c25ffff96ba4182a14dd190f421
pdf-font-stream PDF embedded font (sfnt) at offset 0x175C9 10864 bytes