Malicious PDF — malware analysis report

Static analysis result for SHA-256 b327dd99298b0e66…

MALICIOUS

PDF

92.7 KB Created: 2021-07-14 08:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ebd72ca18f172f575f51272a7922cbca SHA-1: 3f6b9db2d4b568fadaf2dbec7204ea4025865dc0 SHA-256: b327dd99298b0e665f1a3067899180ac19670d81a3badd603f31154321849ee2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/eb6pvla8jhigokvcbevmpdu7ns/60016124304.pdf In PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160944e41de879---melozixutafufasew.pdfIn PDF document text
    • https://alutat.com/data/file/dowewigibiporekusuj.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/31633678617e09796fae24fe6578b2e7/38737606532.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/wonekiterivofijarejiwu.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/pasakibojelug.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/xilizonekolobagofiruraxil.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/jelozoda.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/94246458123.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6f80773cd00a1b5a313faab2569b614d/28404712782.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/vokuw.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abde13738e4---58775919028.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a146044af2---taxaxobisozorekiperope.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/983289490f08976cd10499c4f8ac1c3a/25011683464.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/64445059105.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/revodekijojepadu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3185153d8c---refifekexodafaledon.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/dd25ddfed337fe3d51dc836ecda40c6e/pisuxavigegupidenija.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b55c6bc6c---mijafejivilu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f29e374d8---bapol.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160919bbb6c00b---midaj.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/86595166027.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/p77l2of433kebftmpa41m0i731/gokaxuso.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/xeviwugazar.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce321598e---faletixozataromonisumas.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/58375495308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=more+word+smart+pdfPDF 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_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 17284 bytes
SHA-256: 12a2c6e70b44ce9c8980ff15e65c01a3aca4180f6999e7b6270a6bd38dbb6555
font_01_sfnt_off0001359b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359B 10496 bytes
SHA-256: b4067a49ea3175042702208831e0bad59446582a5ee99fc31660a3af6dc98b52
font_02_sfnt_off00014d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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