Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55294d52db74be9…

MALICIOUS

PDF

102.2 KB Created: 2021-08-17 18:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 73f9bb86a80ea0b570fe976209a5dcb6 SHA-1: a6637512e812df89e224b0cbad71a7c14a55cad9 SHA-256: d55294d52db74be98428f659023d48efd87967d4c5787f9d415c71e9edab3a90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and the nature of the URLs suggest it is designed to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5ccc93cd6---59130749503.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4990e88be2c9e4084108741ed68e8a8/xakujafoninenufepo.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/xirajefopokunodiwa.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/webinonikozatu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8sfc96ev88a41dk07sijt5opun/36508496372.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160982ef304f95---1762905351.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/45442124605.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/94242455340.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/bad51441d5ff074ab53f578f1d5c7060/3398044968.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/matimigemixetutasonibixuk.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160779c19a8275---nemuvakegevuwolajatufusif.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d564d571d5---danezalorukofegikevibe.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/48564260123.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210714_075506.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c62452c478a25bfbb5be9cd612872fc/88253977898.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/21870446559.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/nabutozepataluxirubiv.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/45932854734.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/qlsl46i9dp8btm2rbfdvl4qrql/budumibipopu.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/zokejilelawowexegisoge.pdfIn PDF document text
    • http://liyangah.com/Upload/file/vuzobanefamomamupiw.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fa84d159216efa0037c87bad0cb4f539/tuxumed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cambridge+ielts+book+3+listening+test+1+answersPDF 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_off00012aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA6 11164 bytes
SHA-256: 2c480c0956d107491c3908a17ad02316174dc8940e056c19bc8ef966aac266bb
font_01_sfnt_off0001449d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449D 17016 bytes
SHA-256: e2c7daab4bac7f1893c87814bb9959fd2e6f829fa0a76667322b7431f1a96be7
font_02_sfnt_off000170a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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