Malicious PDF — malware analysis report

Static analysis result for SHA-256 874c802f515a0af1…

MALICIOUS

PDF

96.7 KB Created: 2021-07-22 09:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cdb68b4460f66140d3852ebaa31babac SHA-1: e671c512b3ee84c459a8dcb16ff590447e1611c3 SHA-256: 874c802f515a0af1cd3e9bd576022527ca7355bf7b8de11c82183254ff395600
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://jordan.si/dokumenti/file/38292115129.pdf In PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774802bbd06---nakitinefezil.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1084a6534b---modis.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/iu230vb2dqa0t9ado6ogfml1cc/81044984098.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/51aba5120612019ce8f0cfb348f17bb3/nigitemiw.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/51358863043.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/tfsd0rr3u856o8gnnjn78p0pc1/xofexozageniboparerepezap.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/zunokekugejimiguvamafelu.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/xusugu.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/15486389557.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/tepukenuwedazufojir.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4a808be0b69da79c46a94b06ce2139a5/mejituvumosixezilewizopo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/04d6fec970f6729a0c02ad3692c46c02/28445822334.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/zuvukudani.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/31305077937.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/vosexuluk.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/75475724482.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/17893609690.pdfIn PDF document text
    • http://fairtradeportal.pl/userfiles/file/24674549055.pdfIn PDF document text
    • https://birotex.rs/images/files/rewodud.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a89987de476---dazelaxizaxefov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+does+it+mean+when+you+hear+a+buzzing+sound+in+your+earPDF 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_off00011573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11573 17340 bytes
SHA-256: 731f2549bb7ef64ce3721ca291c7f0a3891290ae6080f238415ee4c10dfb5071
font_01_sfnt_off000142f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B0A 11144 bytes
SHA-256: 9b2e3361eb3083875265eaf397aebea4825820c49574949cc34c21479dcca519

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