Malicious PDF — malware analysis report

Static analysis result for SHA-256 1328a0e10cd93569…

MALICIOUS

PDF

85.4 KB Created: 2021-07-16 14:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 340a1d1c3a27bdebea42c4782604f678 SHA-1: 0fdbffe4d2c7824d0a16a93046f89440119276c5 SHA-256: 1328a0e10cd93569c3bc2e0dbf1cdb253918b7975bb6875ad04e5695cfcb0226
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 installations and disposable hosting domains. These URLs are likely intended to lure users into clicking them, potentially leading to further malicious content or exploits. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/f8116722e7062dd2105dc9248e8a295f/fosul.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf928c213a---bumuvopelas.pdf
    • https://99shayari.in/userfiles/files/zozizi.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4a6099d5a76e6a950330501f0abb7fb5/mituvalis.pdf
    • https://aneri12.eu/res/file/50939820436.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e40d6638d---dipoxizivetenigibopazuf.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e03b257f7e---watigafu.pdf
    • http://areaarchitetti.com/userfiles/files/joneremavis.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7faf262af---kexogoxapibalu.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/jimejodegipuripa.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/bc1d69ba2b2e946488755265bf64baf3/sinupafedasesav.pdf
    • https://isabellepieman.com/userfiles/file/jutezedesarorubiru.pdf
    • http://sobinco.cz/ckfinder/userfiles/files/zakibiradam.pdf
    • https://digitaldaya.com/imagenes/file/61290703882.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6fa4b7c924c861db202270d68f795635/vetupilagimofa.pdf
    • https://triangle-electronics.com/assets/userfiles/file/67009332319.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/k4u8mojjpr24aq7aibjou0dltb/57747155323.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/441a92f978890c3790d761bb46b5c054/kaworem.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160898b3878fc9---19641432504.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ab8704553d555fe859fda4564df41b2d/50220105523.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a42ae167f7e---16091734552.pdf
    • http://beachhigh65.com/clients/879402/File/luseko.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/daf6f1f64339cfb08c5efe38fc9b353e/76229427762.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608364041a2ae---71819280969.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e6e951d50---50375720136.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da22a5df504---98987450639.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+scale+in+geography
    • 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_off0000eab6.bin
0ddb0a529ca645888d1b53bd338ad26c080ffccd004e36f4330d703486e72b38
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 10760 bytes
font_01_sfnt_off00010377.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 16792 bytes
font_02_sfnt_off00011b89.bin
32e8132c5106c4e8834ca5babf7a6c47eea7e3278adf1be13549662416bb4874
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B89 17164 bytes