Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0962865ded126c0…

MALICIOUS

PDF

76.9 KB Created: 2021-08-30 14:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4981687533bdcadaf5be28a919003ae4 SHA-1: 01622d95518a653f0e8f3d0c2a38404a83d372ef SHA-256: b0962865ded126c073975ea11e7168a69d6daf4798cc88e252b01251cc5018d1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs, with several pointing to compromised WordPress upload directories. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vargyasnekonyveles.hu/kepek/other/file/jisetukevezub.pdf In PDF document text
    • http://pieseclimaauto.com/files/file/kifigipoxiwurorobon.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160db2e837c7d2---16145763924.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a11e96969---ditemadapon.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/tirebulomojotutasamugadug.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/of6rctanokvjmigvon8ff6a8i3/28104033763.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/porudixosunes.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/0mle7d5iev7i4ad017414d4ee7/17611692078.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/21027454863.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841976c6966---xaxikulumapikonu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094be3db0a7d---repakaxemupi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609428eb90c0f---77153516599.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3meouv09p41larq349qd957b83/safofoge.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/nepasusuwosumajaviw.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/melavuzadibulimejazebi.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/kowekomezu.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/benukutefusoj.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/52542103982.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/90005243117.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/ximivez.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///97896901970.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/tirufir.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/7492021099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=river+the+flows+in+you+pianoPDF 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_off0000c5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EB 10864 bytes
SHA-256: 440283a990d876348301d837de8ea45cff28ae5f551d3c35efac828d2e374ea4
font_01_sfnt_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 18088 bytes
SHA-256: b37b3c95241b048f23178aa2a6caaac531aea15105456e8ff19096dda0137b18

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