Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa3cdb98c6402cc…

MALICIOUS

PDF

71.6 KB Created: 2021-09-17 09:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0ecdea4a2f1b526cf08a95de3ce070d SHA-1: 5bcbf55bf6df5d2c0a076236614df9d367028e1c SHA-256: 8aa3cdb98c6402ccdb56d35e40486e638a3e80a610420f685e9eab18d59a7e3b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs pointing to link farms hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of JavaScript suggests it may be used to redirect the user or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://petgears.com/app/webroot/files/file/57137026734.pdf In PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/xobelunupekunaxor.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/pc3u9ud4hov0n2fsoujqne3tk9/23810777926.pdfIn PDF document text
    • https://plasy.com/uploads/file/lekuzezifuwagetewiv.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/zevibemukot.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/73805932050.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/92639806824.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/38215964849.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/doxirapiwek.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/51912409790.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/16705508345.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee0bcb4739---mekux.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/mamefomuvig.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/dilirujoledadotab.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/luwetabuxasuge.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/fixajelujavag.pdfIn PDF document text
    • http://erdbau-rauch.at/gibirikes.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/68413030103.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139303666091---1817066200.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/43577771889.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/24403377310.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/50071222317.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134d38024e59---puwedikosifametekirij.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/pasasenuxogugudojudelev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=stream+drag+race+ukPDF 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_off0000b5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 10448 bytes
SHA-256: ee83aa3dd68eed373dad2bf0bcbb96f4fd00486c93353edbeb9c4ff6d17c056a
font_02_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 17028 bytes
SHA-256: 8677b8d77cfe4c94e1f7632edba45e04aba1e10b2dd5e0a1fc5aa785fc4afe7f

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