Malicious PDF — malware analysis report

Static analysis result for SHA-256 db644791a80b3fe1…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 17:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fca946f2cbb1e1c2f267d4684d029fc1 SHA-1: b00b1ac3353768d76fda94e4e60fac19b9ec2166 SHA-256: db644791a80b3fe15dc3563c3dc1c8e54ea6e05a75fb3afcd3c5ac4f7a35aa62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with multiple URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://100gastro.cz/soubory/files/sizuk.pdf In PDF document text
    • https://iohrp.org/f_files/files/38330009609.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210917_C7D48EF38329F8D7.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lepaaq9bobs8ssa6gccols0e05/53262363677.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6146eac7411f70fac953e75dd792d65e/rofesopa.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1619a54c141ddf1587fb979473bafcb8/delerafuzezo.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/wowudigaxunuguwumabunik.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/gadekuba.pdfIn PDF document text
    • https://kawanmto.com/contents/files/pigutopozeja.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/sebosijo.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/nipatojuwipidogodipap.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/zomukotorafurokuwedu.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/desovem.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/35594406752.pdfIn PDF document text
    • http://mrrb.nexgendevgroup.com/files/befiza.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/talotapogafigusone.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/1052210334.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/76533775967.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/vajagemadavigal.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/26184970513.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/tefipakimedev.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/83210977953.pdfIn PDF document text
    • http://scpt.it/userfiles/files/85260531702.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/96935534395.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df65b959e1---pefujirowo.pdfIn PDF document text
    • http://tano-cable.com/d/files/15520473326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=stop+autocorrect+androidPDF 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_off0000c97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 10468 bytes
SHA-256: 405ed4261bc5fbecb95f2d3c5f246c6f223b2b2583d36b61d84c0be4d63ccc61
font_02_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 19164 bytes
SHA-256: bd978cfd32e7cfc19ba558036b437b24835ac80d641bc91d529cdc60d884b126

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