Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ba80a25a4dc08a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-11 00:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 550f47f64cc529473fbaa1b452a07533 SHA-1: fa140fa2785a319ca529b57d1c890626e9c1cd13 SHA-256: f9ba80a25a4dc08a190d674ac61d8baf5ffbc245a9c00517fdc335d81b4fb246
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to lure users to external resources.

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 http://aptekainternetowa.net/_mdm_apteki/file/63644827062.pdf In PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/17630333101.pdfIn PDF document text
    • http://hanauhrova.cz/files/nijusufikiwotowoxawabafe.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/volofujejovenodavuwa.pdfIn PDF document text
    • http://agilesolutions.in/uploads/44201629644.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8sb4n6fsro1rl2g0blgskfpkj3/bepijidivosiro.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/pipadegavudupitin.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/bafiwikilemip.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/1098225476.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/26741931727.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ct45r2ogi02eurbgnpk6vm466s/1112731004.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/32640735405.pdfIn PDF document text
    • https://ms01bet.com/contents/files/35317102829.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/witoxosupuvome.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/51535746070.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/zafigotegoriju.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-3/20210903152905159697.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/nikobubigezenabadiduj.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613417ce65a39---35876100154.pdfIn PDF document text
    • https://laser123.com/geektic/files/33884239551.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/65422694670.pdfIn PDF document text
    • https://mimpishio.com/contents/files/895682822.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc995657c4---melajixaxemaviti.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/mawokexixuxipolovafojitul.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/pafodituzuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=instagram+incognito+story+viewerPDF 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_off0000ca2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2B 10744 bytes
SHA-256: 9e317a0e4f1f782972a3f13692e5a482335df4fbb41bb8751eddf27ee077e660
font_01_sfnt_off0000e2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F3 16836 bytes
SHA-256: 7363207d0a6e92bd34ca119f24d9d0edcf0ea53966308f7dd3d1dcf5ea1036fa
font_02_sfnt_off00010e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1