Malicious PDF — malware analysis report

Static analysis result for SHA-256 28af92f693d6f812…

MALICIOUS

PDF

73.6 KB Created: 2021-09-05 05:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa6db2b022225a37c62a3a042360a989 SHA-1: 13ede469b22288b68e602f21bcb8c818ffb2ac96 SHA-256: 28af92f693d6f81261bef317d1c642661d5e9917ff744472e857cfe05756c03d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=crash+course+world+history+imperialism+worksheet PDF link annotation
    • http://usmleworkout.com/files/file/28277449098.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/pl8tc5dvjl2lr4n3c8ehscst27/rakureb.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/xutatuwe.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/94164595224.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/feruwufud.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/06ufqktts0ts3oras46nlcvfpn/82590264665.pdfIn PDF document text
    • https://limsurdua.com/contents//files/sinigipipixopipojow.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/befivanadasuzusevomagake.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/rogeferewopetaxufa.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/48581798915.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/58418237572.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec42f0b8b---16115153566.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/sozav.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/sofikasixamovoxu.pdfIn PDF document text
    • https://moolans.com/uploads/files/78683586647.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/6ghvrjle5ttqdk7s5ujtf9msah/xeniruzubadukodutokufovu.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/1672711131.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/86400583086.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/46400647845.pdfIn PDF document text
    • http://clingac.com/d/files/nanipim.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fff388530---94201997842.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0cbddbc12---pojirebofifopedizusure.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d68de8ab0---kazakumufikezareg.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/96899758559.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/xitiwazoxozurexuxubajomet.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_off0000bc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 11100 bytes
SHA-256: bb1719d15fdcb8c94553f3fbe47a82920aa0027622bf42686a04677a96bd38a7
font_02_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 16436 bytes
SHA-256: eb8a624dde8a3aff41c16b7dabd00a2f6ab751117db1132311e472575e53d6ea

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