Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb3418fc7c7a204…

MALICIOUS

PDF

69.6 KB Created: 2021-09-16 20:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 371aef1a1107b6f4ebcc0e1bd8c196c5 SHA-1: 0dd4d692749f12f1419e5bc5efeec21d97f94d43 SHA-256: 7cb3418fc7c7a20468af573b7791cf8af4c31889a0233f65d54f413905c38706
156 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. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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 https://medvor.ru/uplcv?utm_term=smart+tube+tv+apk PDF link annotation
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613d26e71e65c---xelebokuzezisixuxonisa.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/18251452410.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-10/20210910174354444530.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/86044595129.pdfIn PDF document text
    • http://alcantara.cz/data/file/rixijujegofuxokotepar.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/40968693869.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/97427085100.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/23742961557.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/80815283028.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/rifopozajefin.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/89044219091.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/gajekilawasikari.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/47983673780.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/bokomitoxo.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/fofipalijoxarolizuvebadi.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141a09149c08---muzewovuto.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/67420543704.pdfIn PDF document text
    • http://ijfbn.com/editor_up/55799609320.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/wugawotatokikutebafaza.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/dasex.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/watirabidopudo.pdfIn PDF document text
    • https://novsport.com/content/File/raruxunimenimuwuj.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/3817671103.pdfIn PDF document text
    • https://zzhqhi.com/d/files/renexinodiwatukunorez.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1ce8573c008ed57705a06384e5812f2c/48935160435.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c53b64594---welipaxamuxelif.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/zaribusotuxixarusefefuwa.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/depukupetusezusozuvepak.pdfIn PDF document text
    • 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_off0000b475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8C 10356 bytes
SHA-256: 81d9af1892e87e3d5c764812e1c5f12df31d91b830d8572afec01e973a7804dc
font_02_sfnt_off0000e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 14708 bytes
SHA-256: 8042aca9c23ff89cb62ce9e6fab898b253f6af5b6e05183b5ef15c318cb8eab6

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