Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb764fb967fc555…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 09:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1673f9491db0489a69d164a7aef9287 SHA-1: 32c9f9ab7d27ab473a93a3b91ad4fd9a93392571 SHA-256: aeb764fb967fc5555658738964f20a18a5f5a10cdd2ba1012fe906a9905652db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised websites or disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to distribute malicious content.

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://seger.cz/userfiles/file/4584753074.pdf In PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/buzanutuvin.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/jajugexemudefevimefoguzir.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b46c7a943e---lefugewopa.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/1745636936.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/wamamekem.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/92120858861344c64a40ba.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/fulujapenumojaxoweluwi.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109071214454659.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/pavokesixotusofabizajabi.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/foduwelakepixilikafa.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/tubisotexokemokutesutiw.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/42037922511.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/zafipofi.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/xakiwuzuza.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/85195456995.pdfIn PDF document text
    • http://prosquash.by/data/27268562485.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135ea546561a---suleguparevuragowo.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/66493355344.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/sezatatunajuv.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/sexodikidifi.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bffd4a5d9a---sokuwexaw.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/78962362361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=you+can+count+on+me+bruno+mars+chordsPDF 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_off0000c88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88D 10720 bytes
SHA-256: 5097f19164dc887de3216bffb085cf31a43f5f3bf0dc03714c5d9a4d72bba1ef
font_01_sfnt_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 17260 bytes
SHA-256: d5768e849bff473b1858ae28d2ad42ccf9545ca362860335bbe16e5e69bbd534
font_02_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1