Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a62f97fb33e9204…

MALICIOUS

PDF

87.1 KB Created: 2021-07-19 10:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 155ab8b6b0a08e8c3236920ec1d160a8 SHA-1: 4446ccf11465c468a272210b6e62daa5aa2a5ee8 SHA-256: 0a62f97fb33e920463fe09c496282641865f8dd92f9e95f022c7b9c33016897f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or SEO poisoning campaign. The document body was unreadable, but the presence of numerous external links strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://arch-teh.com/pic/userfile/45739835802.pdf In PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/65906090914.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/kerugelanodi.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/riluselodid.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/30279734694.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7e0acca44---48350280238.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160761f3b091be---5329720339.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/rurujofubu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3c9947dad4e773a5795091525344f1ee/gozosu.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9f5b3deccf5a2702a88405e29dae101c/timudikojopod.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/19875904736.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607810bd280b4---56321683837.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/80488891295.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160814b75d8a3c---40884566686.pdfIn PDF document text
    • http://iwishop.hu/file/93056103678.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/2221212775.pdfIn PDF document text
    • http://deltools.com/userfiles/file/bumarijugu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41dbe2c366---xuwukowejug.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56583edf9f---51691369837.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/46231764135.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160763df227cb0---kogozibi.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0124e174c3---67975655451.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/53129125590.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e81d115c---venerozosubitufajo.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/nejawovomozapitupesutazi.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095bfe7dc443---fuwipudodewewor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=advantages+and+disadvantages+of+asexual+and+sexual+reproductionPDF 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_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 11044 bytes
SHA-256: 24b5a2b2e57c00312d4e586259285effb552c2689697883da7a73e531e3ad539
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 16492 bytes
SHA-256: 1a890f3de02e563317a92991b454e18cdd569e44009d31c6bfc4361149294cdb
font_02_sfnt_off00013662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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