Malicious PDF — malware analysis report

Static analysis result for SHA-256 24dfc1a1150f785e…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 21:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3624388c26ea0c92522e226994ea823d SHA-1: 5cd8ba94bc832cde10c9b611b2d0e540ebdfbe9a SHA-256: 24dfc1a1150f785e3ba373280e553a24cf52d8c018471952e885a38f87dd9892
196 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tinavaron.com/ckfinder/userfiles/files/3708238443.pdf In PDF document text
    • http://ramenzoni.eu/userfiles/files/govelimore.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/wikifatazeri.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/43173992094.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/85294131911.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/9411ac351325b6c904f5835e39ba3d78/2360464534.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f76334da7---55256936709.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/567870508.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/96473010742.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088543a13142---81254404860.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd379bbc2c---lesed.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c5c3834cf09adf97697e02e6695a862e/nipufizoduxujumaxobet.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/82082078623.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088aa5b14d52---75156558444.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0f47b3fd45e888d648d6bfaa2ca7e483/saditulevoxupiw.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3e0c96f23c00127e5d2baa941d05864c/85028302921.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2420a5cbf2---44041561682.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/nosabafu.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/vabipajos.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/nujemasogapikuwirofedilar.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c9507111de8c17b17921aa9d26923d5e/wogibugekotijakeselow.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/vixeke.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e80ee0b963e986d0a29011f2db875f75/28027563893.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/364fbf9727b21199aebbebb77f5a2cc2/ganedowerekuterijeruvugob.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/tobinalebalisekobupidujog.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161216c1330cbe---35398482972.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/xosaxole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=spanish+for+plantPDF 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_off0000cbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDF 10400 bytes
SHA-256: 43abf10fd868d5305eb3af82cb9f4c723619416fcdde899c028f01fd0ae021e5
font_01_sfnt_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 17968 bytes
SHA-256: c0677f5cbf145b4db404bf964aaba6d48613ea7448511ac4758b9e52a7a5b7d3

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