Malicious PDF — malware analysis report

Static analysis result for SHA-256 f280a5fa2c2a4a69…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 21:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a4de7311845d3c2dd0c71a8148daae3 SHA-1: aa933dcb98f750d591d60b277f24c65e858ff423 SHA-256: f280a5fa2c2a4a6905165f3da5e65040a8f3ff49d8bf9e80f716c56cd5603251
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://franchiseharbor.com/files/files/65898504971.pdf In PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/wowimetunir.pdfIn PDF document text
    • http://hijoin.hu/editor_up/kuxesilubixodujidek.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/43692264977.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/misutiwabi.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/fawibumobusavoranizif.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/33938133135.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/gilux.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9769a5090---zuletowadigozevuresuwagib.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/60031459404.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210919051049_687sip.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/14877241996.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/motelepu.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/fofimuwukavi.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/jawumugoto.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3702480a---45886246013.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/16309142537.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/kenogixepupemegodako.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/34209656133.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c33b1df94c9280e56522013a3ef3b18b/zixub.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/vipuwiloxiguj.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/46880e3ad6596a0d835d7f6023259445/xedelosewowodoxuxinejusat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+rabbits+john+marsden+pdfPDF 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_off0000ade0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F7 10952 bytes
SHA-256: 4c9b493d55c2b78e4fb16a13c0ceb3fbcb21638e3b4ac6f96f755f10d2fddbd6
font_02_sfnt_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 15244 bytes
SHA-256: 544f42d89fed23c1347f67509c5367e33ea4b25cf0d1a9432708be35e1f24be8