Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa09ae77acf977a…

MALICIOUS

PDF

86.9 KB Created: 2021-09-10 13:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1970106be5a6ef4f06e37ae8746d72a9 SHA-1: a2524becb657f03fe655ddb1e8ae8771c025c1bd SHA-256: cfa09ae77acf977a099830ab857bb00e75711bd1d6105ab14aab7b6e7e94387b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=cats+and+cosplay+mod+apk PDF link annotation
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613712ba32c52---jixixifuki.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94826b005---sodedoraxoxumelir.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/26675544582.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/besepujikifafate.pdfIn PDF document text
    • http://zenkatsu.dk/files/58965807853.pdfIn PDF document text
    • http://llux.vn/uploads/files/81764879966.pdfIn PDF document text
    • http://maxbrio.kr/files/files/88556645504.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/15420498526.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/xuralujunotaveretizexi.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/84990228040.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/19063175551.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/vezapareziwotugami.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/37389869746.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///59721514593.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/89408417317.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090508444855.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/36539667429.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acbaa97e02---49971540832.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/lawuked.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/zewotokux.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/peboxaximanimagaloxezejo.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/ravuzerojiwesijubekinad.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/fufodaxonek.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/zibutal.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_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 19380 bytes
SHA-256: 7069e44bb0cb1d0e1206ea5878ffe79306602a8fc80bd649982746ca3f9719d9
font_01_sfnt_off00011d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 10588 bytes
SHA-256: 5c662d1ebccbf352f6ec9ee8cfad706b0d1ad59068af1a817a7c811d7160b714
font_02_sfnt_off000135c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1