Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafeb20083619550…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 22:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f09bc7ad26462bf4f22a3c321bcd90d1 SHA-1: a268fe68696cae3ba4c71b782b542707829dc699 SHA-256: bafeb20083619550a436e6a5763443364b417083bf8513e28916243833f6638c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://coretry.ru/uplcv?utm_term=how+to+open+hidden+photos+in+redmi
    • http://beccaro.it/userfiles/files/54891897234.pdf
    • http://gabortech.com/admin/file/jebavipagerimelagenerejuv.pdf
    • http://mfcpavpos.ru/file/84793067222.pdf
    • http://podwierzba.eu/ckfinder/userfiles/files/96872237328.pdf
    • http://samuiluxurytravel.com/Uploads/file/90624089971.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aef2372f4---pikawinekulepulo.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0de2739cdec27cc4cb91f2220c3268aa/39026501669.pdf
    • https://samsunyapi.com/userfiles/files/lezibibeg.pdf
    • https://pactforfamilies.org/ckfinder/userfiles/files/winiki.pdf
    • https://sinarlangit1.com/contents/files/fuxonafufakef.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3bc242088---56449472667.pdf
    • https://marblobathware.ph/app/webroot/img/files/72113329596.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/45220946703.pdf
    • http://topstec.com/d/files/penigede.pdf
    • http://terhautz.com/upload_files/files/regijanavumutubivo.pdf
    • http://amidoux-peintures.com/ckfinder/userfiles/files/niwupalakajobaxaliwokabi.pdf
    • http://abwninemile.com/uploads/files/vefodereraza.pdf
    • http://tw-jia.com/uploads/files/202109252153039657.pdf
    • https://branchennachweis.eu/userfiles/file/faturi.pdf
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/89823640868.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7941cded307627cc5707c46a41dafd81/zetirejovezolevivamej.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144142364f56---pabazofenatiduxumevi.pdf
    • https://mhreng.com/userfiles/file/26475133751.pdf
    • https://nhabe.com.vn/ckfinder/userfiles/files/lufuwit.pdf
    • http://attlas.center/userfiles/file/47092503593.pdf
    • http://humanitool.ru/userfiles/file/88387182816.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b228.bin
cba3bdc894fecf72e6df69175d35d00c7d7d481581eae04fc1d458b9ddd21a90
pdf-font-stream PDF embedded font (sfnt) at offset 0xB228 16952 bytes
font_01_sfnt_off0000dca3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 16792 bytes
font_02_sfnt_off0000f4ba.bin
61d9ec22c709b726252c75d354302f05a92287dcd239c97a009012a86d6bacfd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 10524 bytes