Malicious PDF — malware analysis report

Static analysis result for SHA-256 17063ca5d2bbc862…

MALICIOUS

PDF

78.2 KB Created: 2021-09-06 08:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 907bd61a0423acd0c0f4ad4f0632a2d7 SHA-1: cb25e0043b8dc87c858ce1fc4cd50fd082dc040c SHA-256: 17063ca5d2bbc862dcec00aa785f313574b5b390a07ae568f7b867e7392d58eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary function seems to be directing users to external, potentially malicious, content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=libros+de+abraham+valdelomar+pdf PDF link annotation
    • http://high-keenltd.com/userfiles/file/janiwoxa.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e37763e6---10076669885.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3c74b3a1---ginewotib.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/pixawonurujepib.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/rosubiwimo.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/zikunusopulomoduzoli.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/wiladeb.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160913e2ea77f7---10237656196.pdfIn PDF document text
    • http://isgsrl.it/images/file/78669895805.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/silidenep.pdfIn PDF document text
    • http://markone-tools.com/upload/files/vuwibewudow.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/863ei77bvtffthpi8ke02e4be5/fukonakejimuvawadila.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8202614a4---95189736824.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/22297211773.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/lc7cq27kvf1oeos3tb55r417l5/wokokawopiwelexune.pdfIn PDF document text
    • http://philipsphotographystudio.com/xuforinoja.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/40536494771.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/54855478409.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/84320251177.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/gusenagabade.pdfIn PDF document text
    • https://seikico.net/img-tym/files/xujavim.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/66745930019.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160acfebf185d9---tivefovabufawiwemujobid.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/xosaxigiwubisevusifadepuw.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/metilik.pdfIn PDF document text
    • 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_off0000c8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 18628 bytes
SHA-256: 48d37110341561a9d2ce98ca325166a98e1f96fdfe07c6d81c9de8edf210c170
font_02_sfnt_off00011085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 10724 bytes
SHA-256: 4d6ca8412fe8de9f18d6e7c2dc282403581df3545e5a870309135ae846dd13d3

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