Malicious PDF — malware analysis report

Static analysis result for SHA-256 3804edfd8d86bec9…

MALICIOUS

PDF

99.2 KB Created: 2021-09-03 21:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e17f95bd1196aa16d4795f4125bde180 SHA-1: 0d75ce719a23937553c16ce5f4b7517af60faf0d SHA-256: 3804edfd8d86bec92e4abdbe6a92c5b933b8c74059e9849c7ebd928acfdb57cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=trigonometry+values+pdf PDF link annotation
    • http://residencelesaline.it/userfiles/files/78156070448.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/33410060091.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160944fc500b87---fadarudivezibi.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/molipetogafifikuwa.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/61781212135.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/1f8f714d6affd38524691c448434cd8d/66496695535.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c3d24d44f96a89c95d21ad368f8113d0/zosukuvikemafefow.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/19230085466.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6260be6c2a---36349187815.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/vitewoj.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/lilusuvuve.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/7cb381aae80451768589d05d3ffc147e/79726984457.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021083120343180554.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/56698573285.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0e89fe42edfaf6e7160ee72225b3144f/24964860857.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/tuponipizubido.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/derevewomamumodevugufaxu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070edda6f623---33642535250.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b54e11b40---lifutulajavili.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/wofurifabev.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/peguxifizabidokoniwamobid.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/16b9644f8de1c295339213c67236ae98/64759246148.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/matefo.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_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 19868 bytes
SHA-256: 53e80ab76e87393a22aed3b44fafd06678f24c582970023513cc7b8524c41913
font_01_sfnt_off00014d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000165ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165AD 11084 bytes
SHA-256: 28404e27c115e11c2840df7e49ddb04e3a4c0a3642a2cd766b0dd91ec36c60e4

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