Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8655098f423201…

MALICIOUS

PDF

69.2 KB Created: 2021-09-18 10:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 071d995ae353f82aa3c623f28b035389 SHA-1: 65088e901ca82bb919fd4093a5fd414513137669 SHA-256: ec8655098f423201643b1fdb28ac4631bc551870f8d4bf912147a125d74af791
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, some hosted on what appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6930

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://sthouseluxury.com/upload/files/kazabezurokekojadupifawas.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/58cn1e9rerglsmfr7n3lintmf9/tolubalulane.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336ea946901---29343381341.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/43939497407.pdfIn PDF document text
    • http://prosquash.by/data/61975957554.pdfIn PDF document text
    • http://halmar.info/userfiles/file/57744389014.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ca94b2940---48082053615.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/kefatixoma.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/gesupopogefabewutuw.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/mizig.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/wojagejevavivolopeli.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/mipapaxagevupixeb.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/wabugasi.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/jidipotepusavabesum.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/zubewipuzakezinuk.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/nijukapunobiberujewapetun.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/letagajuse.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/59978513902.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210901165251_1858732235.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/tejurakonalotexo.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/wozazifisala.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/tuvobemagus.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/mopipezamibisumetojoni.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/6163408076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+magdalen+manuscript+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 11008 bytes
SHA-256: 879b874aa3cd8b9491a35eed9e1811afc98eab80e04b743bdcbd21374fd951e8
font_01_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1