Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ab50a2bac1d167…

MALICIOUS

PDF

74.0 KB Created: 2021-09-27 06:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4651505522d09adc9145483460e0fc6a SHA-1: c687d5d5ed408572cee4c2810259aa80c628c0f9 SHA-256: d3ab50a2bac1d1679c28e9a5f686f0743c3e6e46766fa59bdb2e7f9f6c4b8c0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://canadanur.com/resimler/files/remazul.pdf In PDF document text
    • http://dansecyr.ca/pdf/file/wakeburetusevajofivasipum.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3a40db315---43038665959.pdfIn PDF document text
    • http://p-energo.ru/content/file/13481117937.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/somogenureruvixogo.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/tobarunigux.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/bexuvatexivabi.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/depuzilafim.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/0d660d11a88a3721aa136b60d9ddadd0/wezudavawigufoxenet.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/3318355123.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/xeriferotasuripikekexoper.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/86dd3eaf0bf4ede3f1c746b68fc45584/lakawifuworezisoka.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/92781212347.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/10862263315.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134888a5d74f---zefizovatuturat.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c9f76854c---63374677536.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/detitetapu.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/2283705078.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/12573984454.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/geruturujura.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/aft706o7q97lkgginmamp2l9j2/63663319842.pdfIn PDF document text
    • https://branpc.in/ckfinder/userfiles/files/bonulo.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/73900443096.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/xumisofi.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/tuneximowimegejarofid.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/90224552700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=windows+10+full+backupPDF 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_off0000bac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC8 18072 bytes
SHA-256: 6a8fb9ae0e81ce36163a62791c279fa5a0c6fb1d92456c6a1e2d1ad5ef9b7887
font_01_sfnt_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 10868 bytes
SHA-256: 5cf296eda8cd89f16a2a7e151f33dc4a7cc3717066d2963cd34ff8879baa29de
font_02_sfnt_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1