Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82e256422f082b1…

MALICIOUS

PDF

81.6 KB Created: 2021-07-28 05:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 3e5491301ac472c64789f2ef7d6abde9 SHA-1: 43a107d51f9e5d1a24165ff193b82865a2cb48c3 SHA-256: f82e256422f082b17df3cbbdc78e6690b439d3f6be2b3867de9f8341da0b81e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6314

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 https://digireg.it/upload/desesebuse.pdf In PDF document text
    • https://avonsteel.com/UserFiles/file/nupulofukiner.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/semitobavavevezek.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/k333j272o38pm7jv7h2rduf6g4/40373084978.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/39c35hk4el8kvbl2uvkq84dbi1/41634565621.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/lqq0m7p010nurdvj4tmoh1nkjt/xiwurixit.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/3976066945.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/nesapomut.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608201cfe0751---75389025550.pdfIn PDF document text
    • http://abnicum.com/files/file/voxomujaxalasilitanawibo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160727aa69de5f---zepogev.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1ea079f673b877e6b006e970250cef4d/zoxaderebep.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff8264ec5d---gunozumulape.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a206865479b---57867594995.pdfIn PDF document text
    • http://www.bash.cl/media/file/33890396767.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/gexilifiwan.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///gubotediz.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86846c64e2---pilozivilabadavuz.pdfIn PDF document text
    • https://masihpt1.com/contents//files/lezojinubegujujev.pdfIn PDF document text
    • http://fxmeat.com/upload/file/dfc16be52e75627dbad65adc2f69a5b4.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/e9e542f6b85534e851da147dc6c86879/58925509052.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/99147378773.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/pugurigunolej.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/93999448503.pdfIn PDF document text
    • http://zuche0551.com/upload/file/gapovepipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sciatica+nerve+pain+stretches+pdfPDF 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_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 10692 bytes
SHA-256: e6ef0526da671cefd8192aa76c28da58c8d9367d128da40799fd20cdaeb62ba8

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