Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebbbdc04e1886af…

MALICIOUS

PDF

77.3 KB Created: 2021-09-09 03:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ee579180d004f909a8eb703cb73933f SHA-1: 8362d50483f30c49a58faf91ae9e6a40c908fde7 SHA-256: 3ebbbdc04e1886af475c227a54d82b61489df561353953d4c71ede5a1226f243
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=music+lyrics+apk PDF link annotation
    • https://samsungdvm.net/upload/ckfinder/files/15834693372.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161393cf1c5380---vufigijezilofobinakosub.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/af94c05a86123a920da1dafb1cf5db2b/fadufawa.pdfIn PDF document text
    • https://actorconseil.com/files/file/38933543290.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/girudenobisezadub.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46299839645.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/18ipkngcv4l4q2273ontrb6a42/togituzon.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133a57c6409c---taxefopotino.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/nepovavetijipusitonatuna.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/mufenonusototubeginowab.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/82251001415.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/96106169115.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/xiwonugabubeg.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/lolugufugilawatupularid.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///86207604906.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/94726173042.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/66155051382.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/62742597365.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/86991388154.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/zojakodetakez.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tog2dvng4rufj37gf3re5v12u3/26959428043.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/nozufofebulefuma.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/voxojosaku.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/72646369360.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_off0000caea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 10212 bytes
SHA-256: 7bef45d622e964e0b81b942f44c21d7e6ef32b1c940b16d24342e56c885161b9
font_02_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 17600 bytes
SHA-256: c968cd359803fb2b554c1f153308fad52c1a661de5b7b34e947d52d749446e41

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