Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f93a99c0c19f5f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-16 17:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b80406146df2775cf2bfe773fe6de75c SHA-1: 232a0b9d6c34b5d9e4eab857acc42504df8f4bfb SHA-256: e9f93a99c0c19f5fe7babc81be350a7b1d9ffa8114ffd152f83fbb0a00de98e7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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.
  • 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://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613babad9c6fc---zudaxixi.pdf In PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/87157685258.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/mafubawisotofulak.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/58935685008.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/fisotajaluviz.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/19571340039.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135491be15be---vewigomemewefosat.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/783dda76221b4c9827dcbdd8d070c406/xolivupatexavokivabe.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/797935608.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/kixidogijozoga.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/69844705182.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/67739214807.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142a9713d870---tivoneri.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/3454626764.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/robowakinawux.pdfIn PDF document text
    • https://kimcert.org/E/file/55791858676.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/nomusenofifunewis.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210910165320.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/l2nig9pjb85jnv1aicobforvan/95762192331.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/xusavibo.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/d12518e7c55851e834bffe0325d1763d/66286796229.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/45247907838.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/xuledav.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/rujivumademasasu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee272883a---febonekop.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/10788151696.pdfIn PDF document text
    • http://www.bash.cl/media/file/bileralaketi.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/dakunudakubefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=free+robux+website+offersPDF 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_off0000d23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23C 10300 bytes
SHA-256: 5f229dbe972846de6378878f1006e8e3da0d3ad7ca20402a6246877380542c40
font_01_sfnt_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 16432 bytes
SHA-256: 40a81a529e31f549eb27daf61719379abd72d192650a29201a8689a1a3bed1b7
font_02_sfnt_off00011414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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