Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0c2e6fc9811b6e…

MALICIOUS

PDF

70.9 KB Created: 2021-10-01 05:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60b8503f0b36f82907469171f64b8188 SHA-1: 489b76fdf09764a9e9dfe5bc8c6f6cd9174ee475 SHA-256: fe0c2e6fc9811b6e77ba6145ebbdc3978d96d6f8c2d29a4f1f3a737e0e63e413
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://profiklub.sanswiss.cz/files/file/burupexujudaforu.pdf In PDF document text
    • http://skiflogistics.ru/userfiles/file/vafazedebifexin.pdfIn PDF document text
    • http://huiking.cn/uploads/file/010257318560.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/gexipokonepimavokab.pdfIn PDF document text
    • http://talleresjpg.es/img/file/xikovagololojilepenewuju.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/58665379635.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/tmaq9hu9hlbkolfndsgq1p9ss0/56864823089.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/mokekinumilajus.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/dupamefitanigigonimiwuse.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161407fee3560a---9577222109.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/70351761928.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/bojufugake.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/povelofeweraziwozijeb.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/47f9e47c780ed7fff4f05d857cae6961/nowul.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/27239294067.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/87607701247.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/86315828402.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/32251157937.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/batenewuwunevixopoboxu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cf2d4b218f6e52f1e9be59c3c90a2cde/lovidamawumolofizufo.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/negadikudot.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/81839532957.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/10657932691.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/9fjmag3552o0a4n4qla157buin/55717845821.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/powuterafukerikadipiwaz.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/ganafezumejimutupufuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+usb+driver+for+windows+8PDF 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_off0000b5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 10624 bytes
SHA-256: 28e413aa83d815990d3747c3952aaa5d3c23542f46f688ea2fed52192224d053
font_02_sfnt_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 15356 bytes
SHA-256: c40d0319f8df87cdce93bf47639dc13c6004685b64e3b730a59caaedf47ced5c

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