Malicious PDF — malware analysis report

Static analysis result for SHA-256 66afaeab8a65d415…

MALICIOUS

PDF

83.3 KB Created: 2021-09-11 05:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a42e9fed21592e258f0572d7adba22c SHA-1: bd8a7d6c79c8ef088c952243a4db38a9ccd557d0 SHA-256: 66afaeab8a65d415536aed0a3ad125808f12f61356d13c9abed9c09ebcfc58b1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URIs pointing to potentially compromised websites, including one using a raw IP address. The heuristics indicate it functions as a link farm on disposable hosting, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is being leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a57ae0de191f51697f57a910ab5d8f84/47971939138.pdf In PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/58255217259.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/timunevamozofelexu.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/vefekub.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/76897589184.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a65b27cc7c---66820191047.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/86411252922.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/65767343300.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/97511823694.pdfPDF link annotation
    • http://architettorobertafasola.eu/userfiles/files/31218790527.pdfIn PDF document text
    • http://adriennemason.com/assets/files/mezeketaki.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/88037553191.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/53304774675.pdfIn PDF document text
    • http://pnalog.ru/images/file/vabuvipuvositowepela.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/14696617401.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/telam.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bcec1bd3---xozoniwigamafofivi.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/98065633890.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/10498213514.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/68519804859.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/ximakakewolumo.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109041145061648.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/muzuwuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=great+pretender+anime+streamPDF 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_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 10424 bytes
SHA-256: 2dc3c5c8bb734177a78b897adb79d45a3faac5d601bda379d1635a4e58770114
font_01_sfnt_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 18416 bytes
SHA-256: cbdb033016010923c89c162d12ff1d8e85bad88f0e2a434d916d17eb75d30c13
font_02_sfnt_off0001277c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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