Malicious PDF — malware analysis report

Static analysis result for SHA-256 a964581fee5cba6b…

MALICIOUS

PDF

83.7 KB Created: 2021-07-07 15:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f9919645c8e57a21d60e4e1646c625b0 SHA-1: c7dc6860cc599ce585b53b24629e6ade8cfaf730 SHA-256: a964581fee5cba6b63238bf39391e04453cf92f731b8f17393ee3eccb187a8ba
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, a common tactic for distributing malware or conducting phishing. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. No scripts were extracted, but the structure suggests it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc67275e6a---bikarorafiva.pdf In PDF document text
    • http://evola.it/userfiles/files/wozivawagefowexitidilozit.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/28993416221.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/nijowug.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/8844292239.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/ralobonidabodi.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/44262572131.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/norenarugisutixitox.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/bekokuwinatixiralapifeb.pdfIn PDF document text
    • http://yuha.be/_files/file/gutuledaxofiribedewibixal.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/guzifu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31075a5de---kogadaponidiwapa.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/rerizexanob.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ao493ekhmvlqh5mv254kpnk0pa/gupebedebuwezuluzuwisal.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7a164f7a5---lewujosuf.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9c996885a5016f23f4a7fa96b4e95181/samuj.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/pekakila.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/zokosuvugobuzov.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/18957dbd1ef029af1e7153011bc44ef4/petojuterulogowa.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/28888083468.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b48699912---segobifixu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608544d58cd66---8543380720.pdfIn PDF document text
    • https://codecs.roimages/file/muforarikeletoxepeguxis.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ae77d7befff---49923138911.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/ronod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=beautiful+christmas+wishes+imagesPDF 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_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 10796 bytes
SHA-256: 947aef8a8f4e47c68ffdc685d1a23c2ff9d38453042fa3372c835fd4f724b0b2
font_02_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 17004 bytes
SHA-256: bed0e8ea35c0501a35cc64ba6d9863a00f387659d5f18f4be9952357b7ef2dcb

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