Malicious PDF — malware analysis report

Static analysis result for SHA-256 134fb6b91335dbec…

MALICIOUS

PDF

90.3 KB Created: 2021-08-02 04:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99d88cdc3c61404fa3b37200a6910cc6 SHA-1: 5669245002980f0e3088d6c5ac961c0c69dc569f SHA-256: 134fb6b91335dbec893667af7890e13d422429bbb90664fc4c46ad1b5c5c4521
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the extensive link farm suggests a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://queure.ru/uplcv?utm_term=how+to+win+chess+fool%27s+mate PDF link annotation
    • http://jjmcp.jp/userfiles/Image/file/viferegakisa.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/0k2tmcscntnrse33lnmp2l2cdl/40945756687.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/13589144377.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/56cg5jolrclf7kjjhfj566ftj0/80097885876.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b8557f824bc---12647984598.pdfPDF link annotation
    • http://dabaizhongxue.com/upload_fck/file/2021-7-25/20210725155332894575.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/02414ec942ae242c39a862959132a594/pafixujiju.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210527213621268.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dff03863040---47419496540.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f781d137---gujefikerifonezun.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210724_BA62ED022527B25B.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/27216124462.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/38083725574.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/30814836620.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/vamud.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839bd078c72---pogewesijoxal.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/314950269.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07261ae80e---52620135264.pdfIn PDF document text
    • https://o-dance.com/upload/files/97293081868.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/rerujanuxuvolune.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/70563335221.pdfIn PDF document text
    • http://learningkey.org/userfiles/35089017031.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/cc58c4211071ae960e60c1fcc3ac5de2/pifog.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c892ab7a25---zavon.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d5a123035a799133b02104fec3305a96/20723121659.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d0361766b---ronipufetuj.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a69192f23---donofeloza.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_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 10612 bytes
SHA-256: cd96cfb56c3b666ff5943616cef5ed75bd9ac8e78c0d7108f42f3a5da12dd12d
font_01_sfnt_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 20068 bytes
SHA-256: 1ec1a28c8ea7b27467d3f6a2408e55fe0f7a9acb6a652f5ae929e1819b3205e5
font_02_sfnt_off000142f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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