Malicious PDF — malware analysis report

Static analysis result for SHA-256 423174cb3b92d4ad…

MALICIOUS

PDF

85.8 KB Created: 2021-07-01 15:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: afd0681bc70f3309c2714db3f2d6342b SHA-1: 7c80f916c992487bc59c3f12e3a9a3e5c1162541 SHA-256: 423174cb3b92d4adebabef5d826f322dfcba7a808e43c5267d4cfc653e92e24d
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically a remote-support tool scam. It contains numerous links to external sites, many hosted on compromised CMS platforms, suggesting an attempt to distribute malicious payloads or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of the user's trust to install unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://pixomot.ru/uplcv?utm_term=how+to+draw+small+bird PDF link annotation
    • http://hoangle.vn/uploads/userfiles/file/rotevutebutowuredezi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/av7vo748tb8oqq7n2f5h4bmbr3/vagodanobuk.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087fedbcbf9c---zidavavokipime.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e535bf84c---pebapunuz.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/45305462672.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/78969340219.pdfIn PDF document text
    • http://email-database.info/userfiles/file/23825233222.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/deluwogukosonalo.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/66743786763.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/983qksf2e9l5ljhqjb1ugui9kk/dotavizebiv.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/20037538260a3031e6b6c0.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/fbf2ff1472d5fdce50f5cc242703e83a/dezurifuvivudejexa.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607011b8c83eb---43563120131.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f7bda4c2eaebfec1a88c7bb5ce0530a6/60293105678.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/5af96aca154c764cbdd010cc249b7f33/21899571182.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/47339909388.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/63527253971.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d541776c8fd---3381117683.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/vrvpisfvjr5k3bj1oeirelrh84/41427389919.pdfIn PDF document text
    • https://businesslife.com/content/file/jezofale.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/91096258581.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f95107226d---ribugemuxadariwun.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6j7l2lm4tohcmool38oqiacuu3/80859652062.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/luwuzateb.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/32314902859.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/fagurivuwasomosenej.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/sutotezazapurekudo.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_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 10392 bytes
SHA-256: 34009bc2024c9120b5f60e58131f41e7e35b9f07712c3104f07f49660a29dcec
font_02_sfnt_off00011cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDB 17392 bytes
SHA-256: f9d6edd0803905c03f4953c43e8319e0978a885bf5fdff7c67da49ef2f3021c4

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