Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb5cb7f3106a291…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 12:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 356ea9a91291ea36f8a1862050825a9f SHA-1: 73fac2cf9170e980ee3bdebdc18d9b5c547ebbb3 SHA-256: fcb5cb7f3106a29132ad9286ed173a750767d59e7035dab96e29aad83ff02418
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS platforms, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://milwaukee.center/userfiles/file/noginorijasepeza.pdf In PDF document text
    • http://kemenyseprosiklos.hu/upload/file/mimek.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/86084267884.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/762e1dda472f5a782382e032bf80b0b2/mizokukojimote.pdfIn PDF document text
    • http://dalaichau.com/files/60092257957.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613d277499647---47621414597.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210923072231.pdfIn PDF document text
    • http://gestioniarmatoriali.it/27119838707.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/11577654170.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/zuguxakodixinasegexagowig.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/nenaleniv.pdfIn PDF document text
    • http://tabletopad.com/images/file/kisikezarifivibugafas.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/raxegivajivaxogox.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/40556650558.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/zezosikigi.pdfIn PDF document text
    • https://coil.hk/upload/files/gozulusokawazunixerizowut.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/48888016092.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210912232513.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/60168161808.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/44878342212.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/91732792117.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/witopezob.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/bozazomerogurugojafu.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/44264842304f6981ed482b2919ed1cce/nupezedusifes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dilwale+dulhania+le+jayenge+full+movie+part+1PDF 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_off0000b12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12C 16868 bytes
SHA-256: 027aa4d369b79332c3e88eb6dfd45e43b4eeb0295e9f65cdeec9ad042171bbe9
font_01_sfnt_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 11324 bytes
SHA-256: 7c081f7de8ead3223b133e7d06574edc933bbeaefe61463d90d519d54acd8ec9