Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac5eb1fa2735e43…

MALICIOUS

PDF

93.2 KB Created: 2021-09-03 03:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: abedb48cf956494a59369f2b8d8e4006 SHA-1: 745f3cbdc59160bf90e65dcfc7ffa41a2215dff7 SHA-256: 9ac5eb1fa2735e4309ed28e6d36ecf375a40047423896b2712a8dfd4203099e1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Multiple heuristics point to the document acting as a link farm, directing users to compromised WordPress sites and IP addresses, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URI heuristics suggest it's designed to facilitate initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16108b22f20ea7---matonawazumakaneranuj.pdf In PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/16308087203.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/20423085720.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/4387620300.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/zaxatabavekiv.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3143b30be6---gufewisivifajarulov.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca219646d3---junexomatakubopujunibox.pdfPDF link annotation
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/96482814490.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/47249254428.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722bff2b81c---puwenagip.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/bepefagepa.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///25306222784.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/97308991233.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210804_20EC73ABA7F75D56.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/10472666026.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/riwekusalizimebe.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/wafew.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/zadorujotixenan.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/81afcb220090a8a85f24e88015666636/72936333783.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607438a35eba1---lovatanudu.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10f74287d---razoveveni.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951c8771963---22373420524.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/gowafitamixulo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e14650f32eb---59741854353.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/4529e94b489350b70b663bdcd266d211/20628831569.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d64197de6---50730084930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cooper+biologia+celular+pdf+descargarPDF 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_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 20280 bytes
SHA-256: 961919fa799757dcaca9db7de1b676c01dfcd1e5fbfcb10acf40420593c09435
font_01_sfnt_off000135a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBB 10864 bytes
SHA-256: b3a49a26797e2acf9896f394df0d87d1e034fab08a283317a3e3a526c1ee20c7

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