Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7d5b7a9366991c…

MALICIOUS

PDF

100.5 KB Created: 2021-09-12 01:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f19270c4a8e19fde8e02c982f6078bf0 SHA-1: 7f8208667db72bcedde00ddd0286ea2819b5cb39 SHA-256: 9e7d5b7a9366991ca55dcfd11b28991226f75fc1c10771f768b32c0481118434
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised or disposable domains, suggesting it's designed to lure users to malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://baugeraeteverleih.de/benutzerdateien/faroz.pdf In PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9dc9611aa2573166086aae81f349baea/tutafatiwo.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/jojatapiba.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/35284829166.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/sadonegefigekag.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/futijejoxaki.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/zetubajuwesetepovek.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/nupovefonaw.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/jawewusepatifujidovug.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5b0099d9---12960035866.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/glv8apr233omt6sr7o7bmvhra6/99809421287.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/20576279492.pdfIn PDF document text
    • https://geloracinta.com/contents/files/24639637004.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/xodagifabe.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/83371477015.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/14638981132.pdfIn PDF document text
    • http://koutingchina.com/upload/files/fasiketetuvadejope.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109120502332325.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/wuwulujaniketi.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/jalizedugefojiwepupeko.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/fewevatofezun.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/vusifodixi.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0d5acc3864ed39f34b4e9da94327188f/31187039231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=philosophi%C3%A6+naturalis+principia+mathematica+pdfPDF 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_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 11244 bytes
SHA-256: 4ed58dca8c46b610821ac0cd3b60c63d0ca8a5f7663cba4b2b4e1d63c13cf755
font_01_sfnt_off00013aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AED 18668 bytes
SHA-256: 40af5c3ada4a363680849b5ec678b27befce025d2469141cc40d5fb3b55d000f
font_02_sfnt_off000169c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1