Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa31c2cfdadf2d7…

MALICIOUS

PDF

89.7 KB Created: 2021-09-06 03:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03e95e7fb183b02cb2a839ce186f89cd SHA-1: 4b54e7bb2a8745fe47160b24d8514871a4e35602 SHA-256: 9fa31c2cfdadf2d78ba42e4af210ec2618e6360031545e6bfafaa7c3bb753669
156 Risk Score

Malware Insights

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

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, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to phishing sites or download further malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://coretry.ru/uplcv?utm_term=acclamations+carolingiens+pdf PDF link annotation
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608103871e682---96997700775.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607024ec9a099---64745054662.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/282d854c4c322e5e94ef55e931019787/pesubewopopivojufu.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/28904391554.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/movas.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/motosamoxisojepofobul.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fde9e5a3a---68304691782.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/duajbcmj7brlotg4r1b262v9e6/30522197648.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160753fe1add74---82073758518.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/vesepaxilev.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/gawawejobazugipuzesimudaf.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/sagisu.pdfIn PDF document text
    • http://fotokeramika.bg/userfiles/file/15447665999.pdfIn PDF document text
    • http://abc-tel.ru/data/File/letinetibubolebet.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/68210178739.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071073c9714f---bezoxos.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0df503a7a5---wudomenigorugija.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/wozorizogexo.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/jilawatavomisatotujida.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1627958015.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d97c4d61e5f1b5e751549bb2888a9c4d/xofupopeguxaralomokadowow.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/a11ai54g23guqjc3u8c9mrgfr6/tawilul.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/49560205160.pdfIn PDF document text
    • https://noddy.nu/images/file/38920253887.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/20549043907.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 10944 bytes
SHA-256: 6447f81249a250700a266ca55134bb01612daae19c8bbb29dbc6c55a39431c8f
font_01_sfnt_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 16092 bytes
SHA-256: d2c26faa653b467dbb6702c18a88504f0fdd432c7fff0ced4e7f0c01ef9eca16
font_02_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 22424 bytes
SHA-256: 3daaf671335eaccd77ade144625d93e57717cdc9c51de6a7e69384f3b6e242b7
font_03_sfnt_off00014090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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