Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f92fb1ba4aa0ee…

MALICIOUS

PDF

62.3 KB Created: 2021-08-17 13:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b30ba44b6257ad1723b494159f98dc7e SHA-1: a6b90c97dc4478a0ce5248bea54cdd14a332f69f SHA-256: b5f92fb1ba4aa0eef19fa9eabb21544a776e6b9644219dfa78031db8cc466bba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs indicates an attempt to direct users away from the document, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9034

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=tower+defence+zone+mod+apk+download PDF link annotation
    • http://szwygs.com/upload/59352288236.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/97012847793.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/furiwozuxilewefuxodenupel.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0867caad645af083b92681f03ddc9bdc/37314311479.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758f3398572---bosafaliwiku.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/kuxebovexijiwixiwoxix.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc7fb67316---60329881276.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c27fdd296f2a8016c029c81d38913d03/vidugimigepamovixaga.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d166c3a2ff---61167732793.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/38497848191.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/nalutapobamog.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/suldavbe98chc1bkutj22o7fmk/xulovelev.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/bs7cc8ntumktv9cjobf7ae673o/85727329101.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/77082066946.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/15189363033.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/jivexemigim.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210613184910757.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2fa989c40021be175df4ddaf1aecba81/27820206247.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2cc4fc1c860d6432850c784862e706bb/55875150315.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/fivukoluli.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/mojadotexelunem.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/mevokivepivix.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/79737613308.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096042ee2de9---82549290347.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/85542380758.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 10624 bytes
SHA-256: 382dd1a4341a3c039ba05848bb027362c6a6ea869544dbc5893b835e75c342ce