Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8686bc887361a2…

MALICIOUS

PDF

78.8 KB Created: 2021-09-09 01:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 478ef869ff90e99fd017be4f3e3c9230 SHA-1: d4d72147870a03c85bc50cf42ec99dadf78e067a SHA-256: 9a8686bc887361a258bdd2001d70f2ca8874f1942d8595012c80721382abda7b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the final destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132402772a2d---sediposu.pdf In PDF document text
    • https://adasms.fr/userfiles/file/budogi.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/93200078984.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/52738934151.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109020458331792.pdfIn PDF document text
    • http://giga.sk/storage/file/82607568435.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/vuxidezaxalasepavofinuwav.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/366ecd5220edc881e5167ae97fdf46e6/bebigo.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58223668792.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/76939695529.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/giwinidikakaloz.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/57424421077.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/sisowa.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/tukivarine.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/31112886357.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/73028789651.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/75568404792.pdfIn PDF document text
    • http://citra.cl/userfiles/file/bubojexejutu.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/13048920609.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/67765121258.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/womaxirikimiwawoxaj.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/66b69178af78935d2c899e432cf1650a/dozuvavol.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/refidofibojexunonamo.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/98188878676.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/manogagipafup.pdfIn PDF document text
    • http://nanopena.cz/upload/file/45495351951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=a+series+of+unfortunate+events+book+2+pdf+free+downloadPDF 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_off0000c811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC811 11076 bytes
SHA-256: fefffb053cde9ae6769593ca29d59d0a5ee91feb66d444283bb469eb2aac442b
font_01_sfnt_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 19512 bytes
SHA-256: 6f6a7d959de80198d4e681a63e782320fa997c940329478fef3209e0e23402e0
font_02_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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