Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f64fa451f1bf6ff…

MALICIOUS

PDF

93.9 KB Created: 2021-09-15 14:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7cf7dc83b117826a4e9d27c4a5e9fd2 SHA-1: a53d9ef080b41d8056570801a0a54079b0a8c481 SHA-256: 7f64fa451f1bf6ff29e2fcd2f27f6baaaf35cf6dc8926fb8429322e25102f4e3
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The presence of multiple links and the nature of the hosting suggest an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://topnotchimports.com/ckfinder/userfiles/files/mabeboni.pdf In PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/vugegaruxivo.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/kazedusaxoxokaro.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132b5635d492---befobozowu.pdfIn PDF document text
    • http://unseretochter.com/images/file/kinezaramomufoga.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f81299fc1b---40139778082.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/jevupofuborikela.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/94077708252.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///sowekur.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/76534140439.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/xivetodo.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa03fe539a---49080421410.pdfIn PDF document text
    • http://erpos.sk/data/files/73006336236.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/dosopujonu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416180797e5---94199301332.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/sexituni.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/68842570637.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1159885852613896dd33355.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/pifukabinofevozeju.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/67931786699.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/70290873917.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/26980485935.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/vapokezuxivebeja.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/fikafuwekedutabatamilosad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=watch+gangs+of+wasseypur+online+free+123moviesPDF 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_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 17660 bytes
SHA-256: efc84b554bb2b4b36b2e845b1d26fdd94897d0b6a54feb69f29331c99928530e
font_01_sfnt_off0001222f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A41 18292 bytes
SHA-256: 18a0851109df53e0963ef015c61e9b6039e0c1439c674dea4ba44d876d6e65be