Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7bcd3efd33a48e…

MALICIOUS

PDF

91.3 KB Created: 2021-06-28 06:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5434c5165d49f32894736f56504531df SHA-1: a2d876bd103c8fb1ec5817b907e8b92507735d28 SHA-256: 9d7bcd3efd33a48ee313b211c9edc2bf13e4321c9fc9ca89ae13e45c492130a4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious sites. The document body is heavily obfuscated and contains no readable text, further indicating a malicious intent to conceal its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://smartcevent.com/clients/871459/File/linalavivowawulu.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/29760589dabbfcfd82e3a6a8bdf37398/36879657732.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d4c66e0f859a4b2ca849e85c6d7de9b9/2459625776.pdf
    • http://www.hydro-tg.pro/upload/file/fozarimalubevone.pdf
    • http://www.annaleehuber.com/content_files/file/jumepavuxozatedika.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d36154584---50763472557.pdf
    • https://bharatbiodiesel.com/userfiles/file/62173698043.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/d4395c1a9b18553005342d479a4c7e09/18919636520.pdf
    • http://kids-ex.com/49107529873.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bb01234cd---54708355098.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/161fad30dc53fab57a2e45c7c3e73499/zubadoxidafetejugosemal.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d39960f85---76199415172.pdf
    • http://goldnumber.info/userfiles/file/68675715799.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca95c59a1---73158825035.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30916a2264---kojakubulojesuli.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/n444aabtnmlqg4b63q31b0q7gr/bugijexunor.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/33611253952.pdf
    • http://msslink.ru/userfiles/files/32533371973.pdf
    • http://debden.org/userfiles/file/mimupuxuweg.pdf
    • https://mdteam.se/ckfinder/userfiles/files/segesevarusimopinir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pace+by+pace
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f3.bin
2f0da9cc4ba6323b84f769c21f29f27ea4542306c606b69cafb6eac0844323d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 16552 bytes
font_01_sfnt_off0000fe34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 16792 bytes
font_02_sfnt_off00011646.bin
3207c4eba32fccd886bae4d9eb9578217342b775d1d4d0dbf8afac6c52464b2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 20776 bytes
font_03_sfnt_off000148f7.bin
250fd90aefa1287ea4ae9b0eb5ece6381e5624ba40fd8ac6642c583ac5245d4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x148F7 9892 bytes