Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b158350c4f00397…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 04:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c535f69380775773b6a7a19a25b68377 SHA-1: 893d2d04bd4f2ccde1044e3ab70fcb20614cc658 SHA-256: 1b158350c4f00397f661bd6f2985142bc860b59d86754d0940da3b87fe924cdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous links to compromised WordPress upload storage and disposable hosting sites, suggesting it is part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is used to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://estatepie.com/files/userfiles/file/rivedot.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac88513f67---49474067025.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/8543177587.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/tamekixafos.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2190f1d2a---mevusisatifiju.pdfIn PDF document text
    • http://hncastlecable.com/d/files/xamujexanufaso.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff6146d4cdc---5828038296.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/nofujoganazutowakaj.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/jomomo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/bc4314fc91f682adb08e40a60714b6de/97904928594.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/49030278799.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/75297198040.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/84310937795.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7173f178f0d3a7e423c1807e7b16048b/nipuzej.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/63923331891.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/ratarasexugepugu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1n6tlsp6jj4hhcaimt7ch2lmh6/32210058691.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/45a63949e162f66081b407aa3a8889b5/23405885415.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/35a29f32b50b1267ef9353c4fb2bdebb/fufadinoz.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/99940932147.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/tubujob.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/45785192946.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/44884333218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=balloon+worksheet+preschoolPDF 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_off0000dab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB5 10612 bytes
SHA-256: d349f9792e2767581bb9b6c06f0f5b0f8c73c818ddafe1a67c03ac8eef606b3e
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 16084 bytes
SHA-256: cd6946f256e0c33d36fcfc0b554e6d8823ec420e4cafe7d3ca3136d495001c85
font_02_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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