Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47ff6efb65e099a…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 17:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dcdf1824ae72edd27d30b8109e6a5403 SHA-1: 4b253943cfe44093d1060803e6fff016c984fa32 SHA-256: d47ff6efb65e099aba29c5295f85e4135c0ed159b5e45e7f5b1f3b4c59945ad4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS upload directories. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest it is designed to lure users to malicious or compromised websites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://bloemenwinkelindex.nl/images/uploads/girozasomu.pdf In PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ced0217f8---59370185120.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/vasomosudigobagit.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/fiwewepoputixomilosa.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076173cc8990---97108287965.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/hflg0mil08l596f7tct0ebu77s/todirideb.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/31295118509.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8deffce8a2022a1df39ad3df445ac008/kasetusofesamedoxazuf.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/73702223401.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/mlsqti94bdeucbbafvf66ugie0/kowarizaradukexofubalufos.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/58292061613.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/0381e7740004f663613fd6f2eb293aca/20999572842.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210806054702.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/96734287202.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e02e7c570---52668359952.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/befedunerizi.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/75063691807.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851fdc637fd---74285753626.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/f62p8tte6l78q2189dn41n0rnd/jegolasavugamisido.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/6884643903.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/wakuvakifuxuvu.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ohbvshv97pd7sram8gjcn3mp01/tufofitilajevali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=punnett+square+worksheet+questions+and+answersPDF 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://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_off0000c403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC403 10724 bytes
SHA-256: ec59aefb53d386daf1de1669093e48730dbc0ef68e14e5110cd91f50c394cd67
font_01_sfnt_off0000dc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 17196 bytes
SHA-256: 83a398d084922d8b6f9d2bf3f2e3397f9769113063a08e1f08681c1f7c9553ec

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