Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a1b9750cec8080…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 01:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6fc87c7b81c0eef16331417a78beaa4a SHA-1: 358d07d91a9b5c8e70cffa92da75763ff730a0d6 SHA-256: 42a1b9750cec80809588ed602a2a0a9b323441470925318cb214e36cad577032
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit user interaction via malicious URLs.

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 http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca70adc1f---88947495809.pdf In PDF document text
    • http://bezagsecurity.cz/userfiles/xazanadejimoge.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/32854054242.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/39455265394.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6cc8abca254f55a388230468fb9b7ea8/ludawafodupunafe.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/23285959559.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe993c17cf7---28468885278.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/kodiz.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/755230542.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/fegedogosires.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/29550713683.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210811132713_1979809654.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50169814917.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/muworedebasib.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/kavegaraseb.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/mmni9hs83t1ur666upl6sfhj33/14306553292.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/nujorovulasugukive.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/95220632723.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3fa0bf4c3---76247993637.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fd260fd0654---48737087848.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/lemobonuvona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=manuale+dell%27investitore+consapevole+amazonPDF 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_off0000e191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 10928 bytes
SHA-256: 8eee52024ca8eaf9537f808faad0bd744ac603bcec2c2466924f3afc8dd66107
font_02_sfnt_off00011307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 17696 bytes
SHA-256: 0bf5ae35134ed605d86d31b27140e7ede2f2e20d7ff790c995c51b1273e1d83c