Malicious PDF — malware analysis report

Static analysis result for SHA-256 620c5161d0a9e997…

MALICIOUS

PDF

121.9 KB Created: 2021-08-05 02:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 46765cc23b05f8c16d4e58b71a569c05 SHA-1: 99aaa76ec76ae60313608d4ae29b8a0873af1ee8 SHA-256: 620c5161d0a9e9977576d9d22aed5c4c3f0778f5269c68ebbd89e30a284d8ff8
156 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 0.9989

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://garglob.ru/uplcv?utm_term=is+followers+app+safe PDF link annotation
    • https://bayihoki99.com/contents//files/901823015.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/fe912f8f938a2972c30378e7b66670c7/bodewutesumebedetonafub.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a032d0d6b4b---48148193349.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b03c8046d6---fojolurakuseboxebuvuz.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac99eb2631---73347534371.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/4345542243.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/ziropabudukuvamolepi.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5ea071fbcc5dde636efe03812c1d1beb/96733639818.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/lodisubemujevosamokip.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pasuzaxak.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b39ab494531---ziwuvotegaxal.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077284640053---63287129911.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9a5058a6179544e648433b6c22596d45/46265815858.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/36373135602.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/gimumamujab.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd1a35dce---xipem.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/19216892106.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0935c67d0862fc48253b40b7675685c4/zoxalamanupalozedaxasal.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b097c52ceda---30468177893.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/57649995267.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/pavebisefupi.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160882b9fb46de---somiwifu.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/60702989988.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/vuzufijijovigez.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_off00017b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B4B 18768 bytes
SHA-256: 39a813b8bb3892917e1251acd4fa562a988067981b13fb7590b8a18de3f05524
font_01_sfnt_off0001ab11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB11 10096 bytes
SHA-256: 51bb65e9d29a55108561224d1d3ee7f18786ac9ac7a3ed90fb7b4db582c8c5ff
font_02_sfnt_off0001c1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1