Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de4fa6b18e95ccc…

MALICIOUS

PDF

112.4 KB Created: 2021-09-23 21:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b1669499f83221bcc49d514ca084e0e SHA-1: d9300140180eddcaba9cb394f18164ed7b557db9 SHA-256: 8de4fa6b18e95ccc24171d262f5ba075918ed15d2e38d08fe817fd9b8fd88ca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, including those hosted on disposable or suspicious domains. The presence of external URIs and link farms suggests an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • 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://allytemp.ru/uplcv?utm_term=5e+hound+of+ill+omen PDF link annotation
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/savuruletegunoj.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/dilivuditafexutu.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/redanalilobugifelebalibow.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d9628d785f710404c899ad6ffa47a498/37555292930.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/210643573154.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/86119464046.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/satixadukepinanija.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/fatipazezixadatiwanixi.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/86554443484.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/28527101350.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/13867403311.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/97155853522.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/pusadobegolovamugupij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bcc7ad5e0---xoripelapoz.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483590e8650---42138734233.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/43609579381.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/12030796098.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467b070397f---98697410307.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210901_971C061AC63B223F.pdfIn PDF document text
    • http://renknh.com/ckupload/files/85475879919.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/nagawinabawenoferitepo.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/gexezamo.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/20845189630.pdfIn PDF document text
    • 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_off00015496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15496 18888 bytes
SHA-256: 9dd837031786d5374c65f0243092a133c6a59884321a462e8fd3a39158966c5c
font_01_sfnt_off00018568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D7F 10228 bytes
SHA-256: 831ef3cb5ae5b67e00e51f3ba6d5a95bc8ff9c72df981607568b6df741a17f07

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