Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b4980c386f223e…

MALICIOUS

PDF

84.2 KB Created: 2021-07-03 09:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c43b66009a27f2b270e43e7dc04468c1 SHA-1: 6b62900bec30f9d105ad7068a2bc887b72045e0b SHA-256: 09b4980c386f223e6d5b3e0657d9263a3a13e3646df3836c2a1d15c647ef34ea
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bbpcosmetics.com/admin/upFiles/2021-5/file/rozinozeve.pdf
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/fizamigebekuvoxarosugusuf.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4ab4b150554b2941f999d3798251b775/zotoferokediwawukexobis.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5360a313a0766e29f7ed40a599fcb967/11818926646.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762aea942fd---7548652180.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6f9960a7---69821243293.pdf
    • https://cottonweb.net/userfiles/file/85833251819.pdf
    • http://penzionklara.cz/userfiles/file/wulebuvavilamusi.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd9f8ef148---77021071001.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/7de2fvum3oa97cc2pigmhaddt2/xezegafawojekaboleli.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4c344e569---zinetidipado.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/bac5090577164eeaa335e382bc0258a9/8880827604.pdf
    • http://simonhoirup.dk/userfiles/file/wopobubasujaxopiki.pdf
    • http://rsst77.ru/upload/files/gotiluroluvudomapabu.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96e90728a5---figesedapekobut.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089f3f6e28e0---75708545291.pdf
    • https://bcbc3399.com/upload/files/10056183081.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/55a18df87efce4b66d7dcd6bff09cfd6/29718135180.pdf
    • http://cancercareresearch.com/userfiles/file/danodimi.pdf
    • http://tingyi-bnb.com/CKEdit/upload/files/89280106286.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/18b9a1c21880859c300845d52d0663d5/10559986081.pdf
    • https://bnbcostaverde.it/userfiles/file/27203894198.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160960fbbf003b---91222827770.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=car+runs+rough+after+fuel+injector+cleaner
    • 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_off0000e700.bin
beec7f175e2c8c232aa548132093b21031918cd839aad4570e9fc7a873469d9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 16596 bytes
font_01_sfnt_off00011211.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 16792 bytes
font_02_sfnt_off00012a28.bin
d6bb67a321f51d09f3da2b08ba5ef55d8168d4fd0b63409908fb5475820fc139
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A28 10876 bytes