Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9039b11d36ddfbd…

MALICIOUS

PDF

84.4 KB Created: 2021-07-05 14:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 970c3c0e39a9e831e6071f516d8a6315 SHA-1: efbb46d0037085b4a1f6a0a55f15df11d9a03eb2 SHA-256: b9039b11d36ddfbd7d9fb545dfc7a14ad11d4d3c394c21fcea75e6f73c57ab17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The file's structure suggests it's designed to lure users into clicking links hosted on potentially compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a9decd83d33e8ed837fd50411aab6d67/2785984203.pdf
    • http://learningkey.org/userfiles/43047286496.pdf
    • https://autotrans911.com/thread/admin/uploads/file/vajuniguruwadaxepu.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160890742895ff---33752085454.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/m8guj41rak8r56i9o9dncf6npp/xofovem.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd6705ae9---72857205814.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160724fee618d5---galofibuvepaxonogegok.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e2e7d8301e090ac7bb422a1d6ccb7ab0/buvot.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/8097047e0e2144a9472470e0708db666/guxafezujunomu.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160753b93cab11---zojatuki.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/jln7egoc9pb9g54560lg7ejf77/79848942642.pdf
    • https://gites-les-bardots.com/userfiles/file/60160078234.pdf
    • http://liubeauty.com/luutru/files/91008104877.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/gud9f70hesjr98fu167ij6caqn/peluwejubomem.pdf
    • https://tskrea.com/userfiles/file/kijigevipefajemunida.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/r8f8krbgui742276hue6tdpeq6/kogotodow.pdf
    • http://www.vikingmaterials.com/img/59634786258.pdf
    • http://mulroyenvironmental.ie/userfiles/file/6573706399.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e36c12163a2a83edf1798cfa287b6b06/87713060312.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/sgcg282ptudfam0rvf1fpgpu9u/bokirulapokulapu.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc931535e58---nafumud.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+much+does+a+14+week+old+puppy+sleep
    • 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_off0000e715.bin
d5597e87b20ed00da57bc1a5ff7f8204609edcd15ea7c5f11f14803aeb60eb38
pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 17004 bytes
font_01_sfnt_off00011326.bin
f98cdd34de166bd986a7eb9be37b4856a3590dcf4c128c5dfb049723489b9dcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 10896 bytes
font_02_sfnt_off00012c8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8C 16792 bytes