Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8856002cfce323d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 16:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d546913165e86cc0daa62901f5ab1301 SHA-1: 3f1da3188a93511939c0a211ca556d8a6a0a1517 SHA-256: f8856002cfce323d2ad0037549a9baa4cf5c5b5c6f312c6a5267f9a2503772dc
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 upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URL analysis point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://elitaliaweb.it/upload/file/fijubisunonumolimig.pdf In PDF document text
    • http://omni-links.com/images/blog/file/favitewaset.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/76622228192.pdfIn PDF document text
    • https://turbooto.vn/upload/files/xibinosekoxa.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/logomufo.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/juvud.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8c2a0c749a17750595056b39f7988ddf/19788168653.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/fojuleko.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/58567715453.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/dejotatipuzogobubowulimi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/14ad7dd32911ea0a8901d914d3209eb4/befezili.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/suxubifew.pdfIn PDF document text
    • https://cargotavio.ru/files/file/merunujotatida.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161343a0e435be---waganovobebalavanujew.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/bagiwaxelebodufumebaf.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/xipozasosavaxozido.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/ruxejev.pdfIn PDF document text
    • https://finliz.lt/i/File/90834735312.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/kefupenajititojebufemi.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/nonuwupupemugaposibig.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/xobebotusu.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/viwaxidozexamipiriw.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/wusatefozimanufesasa.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/88407357946.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/rudururozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pet+2016+watch+onlinePDF 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_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645
font_01_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 10608 bytes
SHA-256: 2481932091f711fff59a250852ea16e8dfd9ecadcf9d9f6613a7a58375c63b9b
font_02_sfnt_off00011e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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