Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bca98deb722990d…

MALICIOUS

PDF

69.8 KB Created: 2021-09-01 07:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: e33eb443e8fcb6996e9fb203c5f87810 SHA-1: f3c4f6cba72419054db231f58d43c4c6b7bde12e SHA-256: 0bca98deb722990d3a93cd8e770591db780f001cb07141fd0962d6d5772c66c6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://studioprogettoarchitettura.eu/userfiles/files/rasofawuwixusowose.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160703f78c813a---74666836500.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072f36dd8484---laguzirotosuzuxanamuga.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb106ec97fb---gafidufivo.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/14414961442.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7734bd1d5---72674992102.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210819155116.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/gqhppbk4bhkmasrfqsg8epaku3/xemutezejeg.pdfIn PDF document text
    • http://cy2hand.com/userfiles/wasidukarofevujikovaxin.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/tikuxesezederozug.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/zoxut.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202108101044342872.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/zerujogegazododepe.pdfIn PDF document text
    • https://buyafranchise.org/files/files/16273987811.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/sql2krbinqekrnvsnooj6op1s3/19651194382.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/kojavufarotapinidigurigoj.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/19776411033.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/84309372631.pdfIn PDF document text
    • https://ancoraeducacion.com/images/3846071274.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/71470341826.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8319cffe5---11501209493.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/xaruxeja.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/31202922547.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/43911546954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=8+stages+of+psychosocial+theoryPDF 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_off0000b369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB369 10880 bytes
SHA-256: a697a6ede6233d2abad21c0f971fa9268af9b39a1fdb5cbb157a70fb3cd36ac9
font_01_sfnt_off0000ccbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 14976 bytes
SHA-256: 160626bf03ceac78352eec2b212b7a464b56c1eb067b3169415692356980da4c

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