Malicious PDF — malware analysis report

Static analysis result for SHA-256 499c45c50511b368…

MALICIOUS

PDF

91.1 KB Created: 2021-07-01 10:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a4daa9b2d0c7ec28700e20c0ac3753d SHA-1: a6d71cfff3d984f65afaff9bfbb9bc3a5119075f SHA-256: 499c45c50511b36806b379f9a1a230cedcfcc37efe480f7356f0a8fdca7c93a0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure as a link farm suggests it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gv2l9oi781r0omve0fkqjnflc2/75001891675.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a598adaccf9---55517614817.pdf
    • http://hugslock.com/app/webroot/img/files/93270662718.pdf
    • http://bhttourist.com/upload/fckimagesfile/bejupo.pdf
    • http://waltonjohnsonfamily.com/clients/870437/File/jekiwizipoz.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0eac9a55bcb6bafb1e5a60d372a83847/jomawewora.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e3dc4def8---7617346972.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd1dc105f---25602487774.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/dqik9bbu849llgtm0l0m8of16h/69611016848.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d3ea540fb---vegavaximuturu.pdf
    • https://isabellepieman.com/userfiles/file/89374680036.pdf
    • https://amd-export.com/site/upload/file/89500108350.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bhsfhrmd7c6rsnt40ckv212gp1/34584956843.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b871a8e0c---65920969001.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a676c9a31d6---devek.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2d247e8a37a3905bbf708b1a83c2807f/legedenilepesexet.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/52b58fd30f795121f5bc04f16dc9531e/82091503338.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083acf9e6134---92608107056.pdf
    • http://hanboo.cn/Uploads/file/2021052202161870554.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/f0d51172ba646a9808315c15a772ceb1/mumama.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/2fbe66dc009180a15c80eb3e15bbdc86/ligidovajawifi.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/e6531dkud28kh5pj28qus1li0e/wuwizumagemojalejab.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609d632c9382e---jobozijivi.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/028b13a7ad6b2678514f29d26c974f8f/netefukudubitafexozu.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/17fabc9540bb1fc8c2a1cbcdbaebe88d/94784389769.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1281796e0b1a576f7bcdce83bef4617d/wedadaxufigiw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=oval+and+ellipse
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ab.bin
4ac047caf649670e5a775be83c79bf4b642566e7cc35ac4a135f96ccf3673a43
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 28764 bytes
font_01_sfnt_off00012f24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F24 16792 bytes
font_02_sfnt_off0001473b.bin
80bf6a24a9feb34dbf4436569671b48f138fe39a28b8f00b2dba42c2987c8986
pdf-font-stream PDF embedded font (sfnt) at offset 0x1473B 10160 bytes