Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0225eec67f407b2…

MALICIOUS

PDF

88.3 KB Created: 2021-08-21 00:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0ae0a398037f923eb68d3a63930b8eea SHA-1: 564481652a0a21e51c598aab2facccfb461f74cc SHA-256: a0225eec67f407b2b047f98f0e3e1cdf21f67fe2ef098c490f88c057583335c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings clearly point to a malicious link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750a0402a02---23119216334.pdf In PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de30efa2fc1---71823549145.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/bulixopaluniguvew.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/87302094957.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/wibujabijavudumatojixowi.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/wupemejotamo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c7fe37324d4457db3fdd0dd56858b2ba/muxizilu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/202e746f044e99dfbce96a9782c82be2/33707409949.pdfIn PDF document text
    • http://pneusmarene.it/images/file/59673184938.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609484fb24f77---60193929301.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/kijusipufokaxanupewajusa.pdfIn PDF document text
    • http://trovas.com/userimages/fofabigi.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/26448417785.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/25654295561.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/budufasam.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/sotukemo.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/36160240113.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/0f73a96086a64c43f8f599c1525c288c/jonil.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/87335905414.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092127bd5401---mazolunotasokiwotixibolaf.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4cf968ae---18712753697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bereket+emeklilik+ayr%C4%B1lma+talep+formu+%C3%B6rne%C4%9FiPDF 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_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 18788 bytes
SHA-256: 97d2a88312a5a9ba9b931bbb539469a30cb1aa586fbe5c788340cda6aa907d53
font_01_sfnt_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 11204 bytes
SHA-256: 0496b619a2d4bce078662be88e025485539ca9da09c37713556a851ed0673d26
font_02_sfnt_off000138bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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