Malicious PDF — malware analysis report

Static analysis result for SHA-256 3565fb86f4d4acac…

MALICIOUS

PDF

73.9 KB Created: 2021-09-15 00:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6304aef32075829a7a6688303fe9c690 SHA-1: df25a369a84cecc9ed02a06496e2c1006cbb3f98 SHA-256: 3565fb86f4d4acac213118e7c3ba915a3dd3cae95b882454184f6dcda94400b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=recover+data+from+phone+after+factory+reset PDF link annotation
    • https://tigaintan.com/contents/files/fewevenu.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/34986634129.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/99153364953.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/19996031537.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/13138306998.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/2628747347.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/kifedidagijexelata.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/lozolo.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/35383858617.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/6a55348e531d8cbf22cf7b5aef0771c8/45487105953.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d7208d70---roruvuzolilozivipugu.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/6870516561.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5ec5e1f---xilaworiva.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/zozitalujapupava.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/zaviluzekabixufozisi.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/pagudevojev.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/57084552469.pdfIn PDF document text
    • http://ergakiland.ru/files/files/68729834332.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/15633290261.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/16uk1mk9bl5q0q38n0g2a2i8pv/34063780632.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/gofuzebuburivesi.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/koxazibilipe.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/xujewesufadedun.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/fopubilifida.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_off0000bdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB7 16344 bytes
SHA-256: 453b0020c3d11d7608f0e8b1146b83d97cff38374d9b4e90b0b49285fa1d146e
font_01_sfnt_off0000e809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE809 10972 bytes
SHA-256: 45536142863e1a8d81935e3b12e787f9d6749c3439ff67939e0faa186cee70eb
font_02_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1