Malicious PDF — malware analysis report

Static analysis result for SHA-256 365c635ba32acbfc…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 20:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3816a37e41341cc516cfb78d82419b28 SHA-1: bbb68149cdb8b52c1f0dd5b24291ca224e9da2ae SHA-256: 365c635ba32acbfcd8e2dbe992befcedc73afec905129c085cf0d59e62dff6e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on disposable domains, a common technique for phishing and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of multiple links to potentially compromised CMS upload directories further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ccsl.asia/files/rujuzarofofenadazaj.pdf In PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/7508084000.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/85158874237.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/81719898896.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/venalo.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/bamutafitesipejebujebus.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/zagewa.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/86601189251.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/52827750503.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/97284536865.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/niweroborimosafos.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/71339867206.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/62141538900.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/19402295370.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/08/file/20210908_135158_181.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/mapiwawezedexotupamelede.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133016da7990---40556866493.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/67468553981.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/kiduwurunosutuko.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/dirubutabenagerur.pdfIn PDF document text
    • http://yoron.net/up/files/sazegutelemifeziven.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/61652670a4431098ca8de7354e008032/jidivuramixejatatiwux.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2d89bf25f28adc0ddb89355febd66b50/livizajinoromitujola.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/19031015227.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/voxusumi.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f629f25732bb3d985a521b6e7db2b83f/vuzumajuxemige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=structural+analysis+hibbeler+9th+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_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 11196 bytes
SHA-256: 0419ac8d064363e887476fe9578df549c651fd3b4e800963b050d96965db34f6
font_01_sfnt_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 16828 bytes
SHA-256: fd0f36a261e4cda59d8c801afebd8fba82affbaf69c607290b1277d17bde43e3
font_02_sfnt_off00011ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1