Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91268439120b760…

MALICIOUS

PDF

63.2 KB Created: 2021-10-02 13:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f23d753266835dc2a7b561d919205838 SHA-1: 10425d0048626b204e2cf1a22531df7a61b6698b SHA-256: f91268439120b760645614b9f2b3da510c5df231f98f00ac584103d5fa744e36
124 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various domains, many of which appear to be part of a link farm hosted on disposable or compromised hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to direct users to phishing sites or potentially download further malware. The presence of multiple links to potentially compromised CMS upload directories further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://doingthing.com/downloads/blog/geust/files/lexupotuke.pdf In PDF document text
    • https://siam-royal-view.ru/data/files/62277755265.pdfIn PDF document text
    • https://grnca.org/img/files/files/73408230504.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210906104442.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/59814791673.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/01dd674f87c4f79951eb60f63c970969/98243161456.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/60305121510.pdfIn PDF document text
    • https://springfordfarm.com/sites/default/files/uploads/file/dilupuguredo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/101f189e08c52bf434b656e00cfb1ddc/55821965120.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tujepiz.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/1395115500.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/23174883396.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/vepewudasezewedefosawi.pdfIn PDF document text
    • https://swiz.eu/files/editor/bitisemikodapukifoguro.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/46722182244.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/31319324945.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/tuzatez.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/nobezugewaputetefu.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/44519793941.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/duzewudurunikanuwipov.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d0535cf5---88129469148.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/jezamejosadununevom.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c47575f0c---nebumalowosipikaxa.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/81310004671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+you+train+a+kitten+to+use+the+toiletPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB338 10728 bytes
SHA-256: b03679f87550332781cf82244b232849b05239efd9a8146040e424a5d003b846
font_01_sfnt_off0000cbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1