Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc05966f032b48f…

MALICIOUS

PDF

67.7 KB Created: 2021-09-19 18:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6606bf23257e982b9c9821ce8ef96536 SHA-1: 3ce245addd0ecca860c0c4632410033bbec6844a SHA-256: 8cc05966f032b48f15cea5496ca584b816ba644eb49840ca51f7e6ac203b9ebb
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also hosts a link farm pointing to various PDF files on compromised or disposable domains, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6906

Heuristics 6

  • 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
  • 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://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/57e0f994e5c71a628391db3601188a3f/11544675926.pdf In PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/mopejeb.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/90684772657.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/fejuvaxa.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/xatofupozesibixipavekelaw.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/ribaratenot.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/33128966084.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091713550351.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450a2329cb6---28850620919.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/82254474149.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/luboga.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/73267537256.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090210300218.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/nonop.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443bc994a07---67707726796.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/3448946421.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/25733150183.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329cf147b41---15250614657.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/rusuzer.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/fiwufo.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/87733200354.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/dilijosijemomimutazud.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/mitodesesikowevilegidare.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/64417005166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=american+truck+simulator+for+android+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD77 10896 bytes
SHA-256: 7b32c1b4e1ffd1de61c864c2e7c21b8d057f9c188c02a014f503ce88ab35201e

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