Malicious PDF — malware analysis report

Static analysis result for SHA-256 88323dba478313cc…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 07:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04684215424a2e41f90a069bbef80c58 SHA-1: 5c481b681c22c0e8584719f82a00dcb6f6b239ef SHA-256: 88323dba478313cce68797c5412c8cdae812c43e718004a0540997cb723531a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm hosted on compromised WordPress sites, likely serving as a lure to download further malware. Embedded JavaScript streams were also detected, suggesting potential exploitation or redirection capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160871d1b1b998---58299390460.pdf
    • http://sincaremedicaltour.com/js/upload/gelajeru.pdf
    • https://liniagdanskzydowo.pl/files/kisugabunanuvid.pdf
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/48983424603.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbec7ecb244---28845926649.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/9d52ad5bd919b46ce6a69360403d2310/75682424198.pdf
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/rozomopazoxaduwukafoxe.pdf
    • http://aloeverajuice.cz/files/file/nagavufemupagexapavexoju.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8c32eacde1130841f54119ff4d5ce9c7/tizanoraji.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e487b572f---xuweranuzofutefupusa.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/f9r03uh66s49vn4p9s8q29abei/jumuwigavojo.pdf
    • http://scandirent-new.ru/uploads/assets/file/54387785453.pdf
    • http://fszhenjia.com/upfolder/e/files/20210528211206.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/eb3d6dcba06603c754b9e5a88696c3bd/5496431178.pdf
    • http://tw-sincere.com/upfiles/editor/files/sonawenubip.pdf
    • https://lamthong-marchph.com/piceditor/file/67086763432.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075272696401---80553572010.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f2d1e4b82---moraruta.pdf
    • http://karthikeyanjayaram.com/userfiles/file/35868813579.pdf
    • http://pagyesa.org/userfiles/file/20210613005756.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/4c3340c0a90610befd61c5ff4120959d/87062223539.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9c497deb---bobivojevemenamatuboxul.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b485948675f---90076713825.pdf
    • http://wib24-admin.de/uploads/file/burubonolepazemuvo.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4cee6acf478691b54421a7b95c058e65/tapinikefi.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fabb32f312---68126065862.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+spider+solitaire+for+windows+10
    • 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_off0000ed73.bin
2769c459a7e7ccd3fe8edb70cea0adaa637832e0562fc388d139d35afbe36ccb
pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 10752 bytes
font_01_sfnt_off0001065d.bin
32a2b2758fec48c7b28e5183f1032ff175f32f04116bbea13f55cbc34ef598f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 16432 bytes
font_02_sfnt_off000130ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130CA 16792 bytes