Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b638b20c7d1497c…

MALICIOUS

PDF

83.1 KB Created: 2021-08-21 20:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41687c4281f122c48ac93885e48c9ef9 SHA-1: 8f900708e6038b75099dff9be0c99fda22bd21e1 SHA-256: 5b638b20c7d1497cd85576d13dd2994c01df7fe06a2745e3e73e6ddeeedf8f44
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of a link farm on disposable hosting and compromised CMS uploads indicates a tactic to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://balone.net/_upload/file///panolatutujakijejamalajom.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8d3792d0c---buroge.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607566198e28a---15591221564.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/20843298363.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210729164207.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/4ro60vudgl1rrdatgcq7camfr6/dogakupibuwetabojinegul.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/wexerigefuroxabafixaga.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/pitijizogemer.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9e1fba82ec5413c9cedd48a712f94bcb/79687270176.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/nituzezovez.pdfIn PDF document text
    • http://usateatop.com/_upload/files/tatalixoneferafiwazawenod.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/lemakosurikewukoban.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/wotejimerufozide.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ehkr3jd1id2f0ftt1muug1lok9/74260487151.pdfIn PDF document text
    • http://ud2-140.com/files/65406581591.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/tobotifurizogokuludez.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/afs2u9lt303jebuul4sk97hiss/salujibetuxuxokanoju.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/buzuzururuneteseduti.pdfIn PDF document text
    • http://poorclarescork.ie/images/sezojovoteporuvoforuw.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/tasinesewaduva.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d03863f39c6---jekubevakaw.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cc358fc6---46865582047.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/97817189804.pdfIn PDF document text
    • https://fallsplat.se/file/kiten.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/sivavoxigimuparo.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/20285488776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=10.s%C4%B1n%C4%B1f+biyoloji+1.%C3%BCnite+full+%C3%B6zetPDF 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_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 11084 bytes
SHA-256: 1b2512865f00677d739ffc9002e572e99d78899545e5bd82581555d9a7f40501
font_02_sfnt_off00010e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E44 18784 bytes
SHA-256: 647d1866f6312f263d954b2cef0a284520bc1449af18e8c3d1cd32f198ea815f

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