Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81c89c0de3606fc…

MALICIOUS

PDF

72.3 KB Created: 2021-09-16 03:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd32bdc8ca9b55eca83a51cfc3a6b963 SHA-1: ea175fa602fac8be5abf98ce0c446a643ce57b2c SHA-256: b81c89c0de3606fcf5622e1ff44e45ff9a437a74a9297c01e10ecd5de62da8dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=new+song+studio PDF link annotation
    • https://superpackeg.com/userfiles/file/76219850293.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/fejitujo.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/60753473023.pdfIn PDF document text
    • http://annabarons.com/files/files/gunijurinomegi.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/taxopudimofotugelatodira.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/sasiwalig.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383e371da2b---84686196081.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/tafukezobogerimeja.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/gizizafirepimirumuzik.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ropiwev.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3904b824---1420395280.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/87276304129.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/15739109388.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/rizoxatow.pdfIn PDF document text
    • http://apex-architect.ru/images/file/49725713226.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/22749283851.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb60483b1---16310065670.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/71472479289.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210909_CD7AC0FB975E2BE8.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/23366346007.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/13772899439.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/40612296399.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/tolovatemajatanimotizego.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/padodurasijesew.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/63765652693.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_off0000bb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32F 16188 bytes
SHA-256: 3dfe3760ccbad0d98b053242b065acc96fb639f11db5ff85ec34594040e86e52
font_02_sfnt_off0000fceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 10276 bytes
SHA-256: 705cd4a4c8f25dc4f778641f86014a9a6dcdd0f1483f30dba546e6173f2a12b2

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