Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1e943b868df0ad…

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 04:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a6c8a40d7a02de48b53db8239179dc27 SHA-1: 9c1002c4ba06c0e5b9e196276a65c01fb4861138 SHA-256: 7b1e943b868df0ad2520172707d372e7e1565ede7d3a201c10be607d679f648e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dlzhrjd.com/images/uploadfile/files/peduke.pdf In PDF document text
    • http://giovanninociti.com/userfiles/files/91060709483.pdfIn PDF document text
    • http://halaljones.com/uploads/files/81418156404.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/vavupute.pdfIn PDF document text
    • http://entrackintl.com/uploads/33543487778.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/nqlbigtdm2o1gi5ig3f0oik0uo/88608508249.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/nakezogurivome.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1a4aadadec886424add2d0a038183167/talupoxokum.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613b112510c84---65740859435.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/lefupefisivapoxopop.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/pokenagusutix.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/nevadalibadit.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/tojikeguxiwixirixiz.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/vebogomumetasenudaluluj.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/bc4d03c4fc10abcba587fde2917f6aa2/71653446676.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/21670089803.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/nevidogujosavitunaxireku.pdfIn PDF document text
    • http://vuason.vn/upload/files/zaxulijedipudot.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/42401430467.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/poxukemedu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc8dd86efe---2904371166.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/61878845111.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/pagubizavigowopevonopazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mods+for+clash+royale+iosPDF 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_off0000cd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 18064 bytes
SHA-256: 74865c09005b21c81bc7bfa9360e648fcfc62b09d1f4930d31af5f40d2355dcf
font_02_sfnt_off0001145b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145B 10476 bytes
SHA-256: b10f2c2b586a04dc52a3bece2e16752f8f467442247985214ef3e7e87537aa4d

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