Malicious PDF — malware analysis report

Static analysis result for SHA-256 83110f2cf8a7ea3b…

MALICIOUS

PDF

73.4 KB Created: 2021-09-23 21:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 99737f1e77e1489c4e21db2661107e50 SHA-1: 482f250bce136579941075deea17c44ce366ea37 SHA-256: 83110f2cf8a7ea3b7f7edcd3af82c550bb8f05f3ed81f78815ad9578402a398a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content or downloads. The presence of numerous unknown URLs hosted on potentially disposable domains reinforces the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3637

Heuristics 5

  • 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.
  • 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://pitchdecor-construction.com/user_img/files/samadewifopiperefobabavas.pdf In PDF document text
    • http://termosystem.pl/userfiles/file/80263806520.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614afd91f0831---nupogifajifosofo.pdfIn PDF document text
    • http://fitviewer.info/files/file/1813407857.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/kagimum.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37da39f67---wuzukujotunevalozoligome.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/kudowerom.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/10964512996.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/36296466144.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/58553974512.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/negopurovilalimew.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/zegalisuwuduzusorowojija.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/muvaxov.pdfIn PDF document text
    • http://pileki.com/imgup/file/65497268398.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/59661920843.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/79268666148.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/500575440.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/joxigore.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/badifovive.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/33852725694.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/zawudib.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/nafonefawuru.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/68aed2af2407b7c5ce56d5fb85c1c7ee/xupovarifasoxigubujixujev.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd55ae254---2014230680.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/lusuvibixanebex.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/mipalobesum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=acrobat+android+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 17628 bytes
SHA-256: 99c563ef4a5430dbdc69a25126b78e35de0604fabb7e1c2d35eee04e1a031732
font_01_sfnt_off00010eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEB 10376 bytes
SHA-256: 79b86d2166d44668149759a92ab7b6455184a484fc0dad4beeda5d8fce60ac5c

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