Malicious PDF — malware analysis report

Static analysis result for SHA-256 9291c45b3a261f54…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 23:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1db082ab4c3dcb7a6276de1151a2aa9a SHA-1: a3b7332e36ef5992fdcab7f33a55b836c586ddd3 SHA-256: 9291c45b3a261f5464761c805cf35047c82d9573cfccdc91e90dc45d7fc12e11
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fenixfalt.com/userfiles/file/wizewuxomobukorebebe.pdf In PDF document text
    • http://sweepinstyle.com/userfiles/file/47848274345.pdfIn PDF document text
    • http://partnercable.hu/files/jokanozin.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/bugaziwoxizakiro.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda159c51f---23666575284.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/tetakupivolimo.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/wofeganimobovafajer.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210903_6D2AB40452C0C21D.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/dixajukudolup.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/90305997556.pdfIn PDF document text
    • http://aurora-c.jp/files/files/kadozidaxuseri.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/84622431931.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140336269cc3---85097271734.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/27311264468.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/gofifese.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/nasalote.pdfIn PDF document text
    • http://osayit.com/images/file/wofurefef.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb801e998e---jerav.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/gefigopetune.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/98021714828.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/85690267898.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/43594715231.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/83942190504.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/kazukiroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=karnan+tamil+full+movie+tamilyogiPDF 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_off0000bdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C2 10660 bytes
SHA-256: b308670edcac0f2202862dd0d81e4bbdedb131a33c393682e3b5fbc62163d854
font_02_sfnt_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 16848 bytes
SHA-256: 74742ab16623a1f604b4e7d0a6f4e1c0e239a2cf9659eb26f8d5811d6c514f80

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