Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97b8fbffcb77a7f…

MALICIOUS

PDF

100.8 KB Created: 2021-09-20 08:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 69ab2263ea3065c2e0a876d75ee87391 SHA-1: f68794a27ebb5ff40b253f033c79e7848f390e89 SHA-256: a97b8fbffcb77a7f457cf4ba571cdb400700a0a22db5c1bc98e8922f656acfc5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary purpose appears to be facilitating phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://smidgel.ru/uplcv?utm_term=live+and+let+die+full+movie+watch+online PDF link annotation
    • http://kqcme.yiaiwang.com.cn/upload/files/nuzokemadatuzevalexariwaw.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/funobotipawudapafatal.pdfIn PDF document text
    • https://synersys.fr/contenu/file/pemuzadutoji.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/6699349016.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/40290574344.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0fc0c48e2---rovidowolitedowe.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zijoduxija.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/bosidekoxujub.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce3d51d6a---wetonavamud.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210912152558.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/damemixixinanutiviranulub.pdfIn PDF document text
    • https://bczenekar.hu/files/file/11358906632.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/dakokekeliboletadefud.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/xebowil.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/waguverowitakemijid.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/27972921189.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/jurabafelapibikuvaf.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/70717326126.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/lomerofozofelafiwa.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/fumuromitemisebedofogez.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/zopenuzonolasegiwipekeji.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/rewevuxov.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/34674194665.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161304a629fa3f---degekimuwenim.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/felonibe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011fd1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11FD1 18220 bytes
SHA-256: 59ed995dd4e2e19aa3339d2b2696749ae3776be666fbca89fca4d00f1e8837e1
font_00_sfnt_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7D 18240 bytes
SHA-256: 5a93356342d445ad7a261b0767fb0949a9f3e0bf1d692b290edf5e9def663197
font_03_sfnt_off00016bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF9 10684 bytes
SHA-256: e8508dac82ea70c2ccf021f0cb8c89c87c054e9df155953ca74e8d96cb6bfe43

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