Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42a671836358b9a…

MALICIOUS

PDF

86.3 KB Created: 2021-08-12 04:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85ee776749c3e9817bb2b90ec0979f7a SHA-1: 699152605cf557ef553a4a9776621d75e1058023 SHA-256: d42a671836358b9a3f83daea04422dde0019538b8bb12feef4015fff0bcd971a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are consistent with SEO poisoning or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=how+to+use+android+auto+toyota PDF link annotation
    • http://gewald.ru/content/Files/livole.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/f44cmaosr71tiv4ttvn4lb3ias/51537210180.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bff280b030d---xipudosamufewukojekuso.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/586e8gflc94hglqg1fvgaaglnq/watusadi.pdfIn PDF document text
    • https://x-software.cz/data/file/nelokofezu.pdfIn PDF document text
    • http://houselandia.ru/files/kuxobamewewonowubinopetud.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/10593693953.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3aab0582e---zeruwazijiwopukoxez.pdfIn PDF document text
    • http://oilspecchem.com/files/86872673886.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/divovusafapaloxase.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/7r6ih44q865q4rru2q0c4jhhrn/30493525498.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/6mi67nh6aaooj3nbl4rt7e3c66/wonejorokuzu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608369f711bb5---17565519868.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/84250794133.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/2577565347.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610ca039df8f6---43815702963.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/tpa7sng5g00fk99r2n8seoaqm5/pumaxoluxeladezekegejux.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/zomozisajevapubudis.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/t4es1df4sh52smkl7av9oltj2o/41061315860.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e41b93d4039---48451356272.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/vefob.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/51874972237.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/gudisexezonirulego.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_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 17100 bytes
SHA-256: afba45233bc663d3e918135507429e3771f10c28043b65a8c78090c112e1f3e4
font_01_sfnt_off00011b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B81 10484 bytes
SHA-256: 3ecf9f86869771cdd76d3920d0b80e231ad4a69a7c34e4ce462242b5c6902d25
font_02_sfnt_off00013386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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