Malicious PDF — malware analysis report

Static analysis result for SHA-256 da91e979f319d91b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-08 09:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7074e5b80939dd03ab3430db6684fa8e SHA-1: 97ed98a916a4bc18dc05798192129f89c1187636 SHA-256: da91e979f319d91b794b100b6a6cc8f3bc00c0266fab9fa2c2e8fcb83a765051
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content through a network of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.pilartangguh.com/file/95714950633.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a962e32730b---wikazemunatamexudovufan.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/xilenozipapenagetaxedem.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f7a0613d4bf8c34d31dbe6a6b129e616/26537339056.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/t4gtlk7ntk5dhct9rdc1pqulvf/pusijizovigu.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/448f96d54f1b5fd6bb64ffd8d89d3b44/11473602024.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/647bc7d264965430198b6cd6a32a9341/zizuvumiwi.pdfIn PDF document text
    • https://10fci.org/userfiles/file/58651935036.pdfIn PDF document text
    • http://healthywithhart.com/res/file/43774409420.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e5bf135d6---69744645378.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/fobexew.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c57c39c51983f172e56ef48a94b795a9/33809996250.pdfIn PDF document text
    • http://webbuilders.com/files/file/xisamipikakugiwutoze.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/81427090536.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/solepovavipefipi.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/vosaruma.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/33157794390.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ae587eae3---joworobu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d763ba5ec---sisiboza.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/nns3ghihr5cmroum21hdudavcd/86939131558.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/nijokijugizi.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/hp5mk81vgilg7a87ja0a9gcjcg/82346927852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=resimli+yemek+tarifleri+kitab%C4%B1+pdf+indirPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A0 15744 bytes
SHA-256: 45d36c540f20211de94d98b6ef498b375a8a9e6533e8eb5799f90e9e438b67ce
font_01_sfnt_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 10976 bytes
SHA-256: 53d4a451d8c66fe240b8196bba298fc226ac833040221e9ca6ec775e9d06f508
font_02_sfnt_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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