Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f412d5d618f7811…

MALICIOUS

PDF

97.1 KB Created: 2021-07-27 06:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bee620f2cc15dc6266fbdaf5e08086a SHA-1: 18d15e3eebf60d22b31d778f77aa1ff3be0c46cc SHA-256: 8f412d5d618f7811cdb959015a469e3b87d3a5c207e94c6ed799fe2b31661710
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the heuristic firings strongly indicate a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdc422180e---wabobel.pdf In PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/e7e67bb3c42998e8173db5e86b1493aa/wuzekovifivufodafamez.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/zojimuxebezidafewiwawar.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/51762429604.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/75953149599.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3930de930bc85b91a6379387a0eb3d00/pimobagi.pdfIn PDF document text
    • https://33mobility.net/uploads/files/senopanog.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b151ae7b43a6d181d3fee1bace8e7a2f/32120615458.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/bd9c164d1abc10850e01513e398845ce/82554674610.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b062cf211ae---30835232613.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a84dbc35264a7b76cd0a9eded0b7be47/vesedi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f539042f91---82016205327.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/96589044914.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/4840026856.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca58392dbc---56524395295.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/davodovimu.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/44971784536.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/565aa787bcba32f999a311688f6bc342/toxuvono.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/92144472381.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080aeb6c3e37---gezawivibuvuvogotadepipe.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d3d9c0355---burak.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a085f6465b9d26ddb120d96bafa28e87/47638863678.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/37492982377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+are+examples+of+newton+3rd+law+of+motionPDF 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_off00011488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11488 18100 bytes
SHA-256: da039a4ed9392b4ff93bf47266c37b45e86b17f5693e11d06e13618872d70681
font_01_sfnt_off00014417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14417 11116 bytes
SHA-256: c74ec9b6e9fff8bfb44cd0e24892866f5dca0f0420206563a9d30594a9b596fd
font_02_sfnt_off00015deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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