Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b31143abf2e40f…

MALICIOUS

PDF

85.4 KB Created: 2021-08-20 16:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e963a55595ea7ac1652c036334ec521 SHA-1: ac1ee8337c63f64d28094a228f78ca200317b877 SHA-256: b4b31143abf2e40f5139231d1aa81b18369a6b8bcbb366c13fc84be99cd95219
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The document's structure and link farm characteristics suggest it is used to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3778

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://cuacuonanbinh.com/userfiles/file/dunamurunodezajufagu.pdf In PDF document text
    • http://hockeydh.com/files/ups/files/19052397366.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/sr1p43r6sgbvbk9d2bkacf6shd/vemolodawukutexoxumusef.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/palirege.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/68454ea3156329a3a9de10da841eb9f1/pazetumizogujadumeval.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/gju4v2d7ubrnd3bpd3lq7or1e0/91023100168.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c046d144e60b8c14a90530a1130ed0d7/lidevav.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/46234105690.pdfIn PDF document text
    • http://allycatering.com/userfiles/51687433261.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4cbc34e38---97180478708.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0a384a23---xivowibid.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989baf42d2d---natajibaname.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/kitusotuvemowo.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/vimupuvalajul.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021081712500_392156444.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/wixezubasom.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2502e15354---lijeduwekawubal.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/fa23673ee6dbc5b703401382405a014b/55988278771.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/xazodomavazujuvagonilu.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/86499885847.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/sapafumebubamixanigoma.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/93joh302qqgudtp2tptgfaoe35/zemutumisanekizaworaj.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f0c507d9e964af5622d14c947f71ecc6/xakamunem.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c126e1a48d---xilex.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/15062644638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=suma+y+resta+de+decimales+ejercicios+para+imprimir+quinto+gradoPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 18500 bytes
SHA-256: f4f7c517fd36661fc967536a7983bc9e68cd069caa2177ce32807858c2505209

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