Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ccbb2abed67c30…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 14:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5067be21dd50c93db029b060b674180d SHA-1: b686c7c9d8bfaee0e0967bbcb78a42605e222745 SHA-256: 37ccbb2abed67c301937d43912d8c11457992530ae2916c6db1ec0be21e9b9ff
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains identified as disposable or compromised, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further payloads or engage in phishing activities. No scripts were extracted, but the structure and URL analysis point towards a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cauthinh.com/luutru/files/10106392257.pdf In PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/11406062821.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/lawedugavapanotij.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d14170b3---degoliwajeted.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/totewakalirexurinapewupu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/9e8a14de4e3d32cc5de40975ff607012/somuwuzilare.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/zunewaxokesebovene.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/xepetuvabugifafiju.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55826af26---2195498970.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/63416420472.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/63044008836.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210630_121654.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/jopiz.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/33287090318.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/38045501853.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/72768338671.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/lefaxefokupobazawexugur.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8c061d3a6848844a5f975cf084d5ad06/19494884996.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/48634208961.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/10793298931.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/jeruduzizezufadoga.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160840bd19f429---80023859175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ernest+becker+the+denial+of+death+pdf+downloadPDF 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_off0000d40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40C 11020 bytes
SHA-256: ee1e64b656954e3973f5341eb6d1beaffe01d2185ca7afced7b768c85fd28176
font_01_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 17808 bytes
SHA-256: eebf83dfe671cb2e45837612866c55801234963042177f5643a3651907913093
font_02_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.