Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c271d6198fa7d7d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-03 17:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0666ba99bdd6aa42ad257b2d7fa5790d SHA-1: 6405a030777b4e8696dcd24737852df372cc70ae SHA-256: 5c271d6198fa7d7dca91eeb1397857762d2ed00740fe6ffa727fdefcd83d52d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a multi-stage attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://crewmak.ru/uplcv?utm_term=crucial+conversations+workbook+pdf PDF link annotation
    • https://torbay.ru/images/uploads/file/zuvegisi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09de2ef240---dafiz.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/50252625876.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/konexobag.pdfIn PDF document text
    • http://zgic.ru/!upload/files/kalumik.pdfIn PDF document text
    • https://ms02bet.net/contents//files/27164917605.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/zuxededimaretogarizawuk.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210727103322.pdfIn PDF document text
    • https://www.casestilistas.es//ckfinder/userfiles/files/lorepapu.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/52026058517.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/fitizuwabegenag.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/pitetikaga.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/wijotudapemabefebak.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/30294510409.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/53a8a7f779113f40afbed0244ebcff4d/patekekitige.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/9688132737.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/lukirokajekus.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/84318918250.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/88691013702.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/q1icjlua522rhghtfqf0ouah65/11570829682.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/rowem.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/pqkmtfb3f815rve5actk4cdqd4/juturinagirifebinala.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dca1e2c97---56192304653.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/tupimigerelomorakug.pdfIn PDF document text
    • 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_off0000cc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 11128 bytes
SHA-256: 8ebee11ea20f8a4cc9db253895a04b4fcf56fdee95521fe16265e52bbc4d15c1
font_02_sfnt_off0000fe33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 16432 bytes
SHA-256: 05c3b274e5d742eaf19287bd427cc33844d961b1d2b1d9de6d9bed65e8da2896

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