Malicious PDF — malware analysis report

Static analysis result for SHA-256 46bbdc062576e763…

MALICIOUS

PDF

90.5 KB Created: 2021-10-06 01:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1028893ec412a6f6015102ee3f6bf56b SHA-1: 86c534fd49c70dc6387d02c2c70d6dddeee737b5 SHA-256: 46bbdc062576e763a8d6f3877e0a7825c2cc3ef8c904ae8e3d0e1908fa5d6dba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to direct users to potentially malicious or phishing websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=mcinnis+canyons+national+conservation+area PDF link annotation
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/lvcrulpsv6v6gvqh22gpi7sps0/famemujureniwageribonita.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-20/20210920040346579142.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/28014895538.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/83301666991.pdfIn PDF document text
    • http://futboltotal.net/images/files/lezunexu.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/jifevitajugakofape.pdfIn PDF document text
    • http://lblussana.it/images/file/44839957310.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/rebinedapalavuwediw.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8c593c07---tefoxe.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/75841969841.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/gefex.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/kojatavudilopuve.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/223958495.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/besewiduwixijepo.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/b112ec48776e08098f5a7c8532cec544.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/43315844456.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153f316a8d3b---gotofutofokejaruba.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/93756273399.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/19767528357.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/37243364824.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/47117200150.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/rigilufuzuxipagowunam.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ebaa8731e28520074a7ec3369da14377/rabogefig.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/tomusovaf.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_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 10396 bytes
SHA-256: 310578e4f391479845c2f6e329cff09e9b861ed30c9c65c158996352c81920ba
font_01_sfnt_off00010d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12540 20940 bytes
SHA-256: b7ab17328d42d67162ec1f5d4e24dc8a04edc914f06b85337fcccbfdc1896854

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