Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a211ccb2d3162e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-14 05:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c951bd71a4ad2a451a409d828a67aec9 SHA-1: 26917c29d2fb4e20db3728523955718dd25d4c92 SHA-256: 89a211ccb2d3162e74f8b2e7c2de50487196f48da837a50b8e942a68e6ee842a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing lure or a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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
  • 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://wonkingchina.com/d/files/81062973634.pdf In PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/xevabawaxigepesu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613012cd46973---82026089443.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210904060152.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/7441166615.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/92809609268.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210905_195331.pdfIn PDF document text
    • http://laserinnsbruck.com/static/ramelajetular.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/berawagetepatenexexuziru.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc40a58ca9---88559928479.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/bogasenoru.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/57351735439.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3412417c1---nedop.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/wotusogaketiwagolineke.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/92493008509.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210914065754_a2Vyb2p1bnV0ZWI=.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/nujadipuzimawedafexatilam.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c11e4e699---38186756425.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/68730824065.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2a02ae58---popugot.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/44507962921.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/tunijididijasu.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/tokafutasetexe.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zetatezif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=fahrenheit+451+part+3+pdfPDF link annotation
    • 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_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 17360 bytes
SHA-256: 3ec748d91d82e42c6d16a7e24caba4062ec43fbe119cb58fd827e62fe77863cb
font_01_sfnt_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 10672 bytes
SHA-256: 8b35f6a21d9eedc04cca1e9b70d8adda6104cd07ff79bbf3ecbe5214c6871c85
font_02_sfnt_off00012e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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