Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9bf01f0333775e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-22 15:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d558ff145066fe86e0c3e20dc495622 SHA-1: 31b5c5a7eaebb62eed143a3b6fdc094e6153c45d SHA-256: fd9bf01f0333775e278a51224b09ff8663060aa4ac758d3378ad92f0c9a0d4a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sportsslife.net/upload/ckfinder/files/xukubaxajanurodixuvoxamoj.pdf In PDF document text
    • http://prepearl.com/uploadsfile/27219439565.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/fisawerudawan.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137454130e74---53372251205.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/mupubutamezazu.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/68360136675.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e590477d729d9904fae7cdb970affe0e/80166613681.pdfIn PDF document text
    • http://belovosushi.ru/files/xelikem.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/zakeke.pdfIn PDF document text
    • https://path.mn/userfiles/files/mudiwenevodeko.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/92060781344.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/9359873831.pdfIn PDF document text
    • http://metallpress.info/files/zumazuvokizotumakejukuro.pdfIn PDF document text
    • https://tele-video.ru/upload/files/59051842945.pdfIn PDF document text
    • http://rjt1.org/upload/files/nimuxiwanivemeg.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/digalajixagigijazizemil.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/55842144550.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/revedewibov.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/wemijetipinuvu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/33a3245d0d6bdcb86ecdb79aee7b9e6f/towoneku.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/lejafonirumulupa.pdfIn PDF document text
    • http://progetec.org/userfiles/files/69034220813.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/49323467869.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/30541662761.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/69288289492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+connect+mobile+screen+to+tvPDF 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_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 10512 bytes
SHA-256: 1944343ec4bb222b9530284144d9f75c602206630eff306d0910fe98910e685b
font_02_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 16992 bytes
SHA-256: 7e912791baaf5312599601784d8ad93f818415578786e6422cf3a3b2d6122c90

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