Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfa50211da9434d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-13 07:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 34797bc069f474f5a8b8e2976d554399 SHA-1: 88333aa8262ec723775bef8ccfe2d1d0e8e20a6f SHA-256: ccfa50211da9434da6acb8f67fab53b941887357af4bb23159f0711c1f410eac
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The presence of multiple links on such domains suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://beverly.kopanramen.com/uploads/files/ririnob.pdf In PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/73155602391.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a15de25c73535ad2fa4b47532e8618de/vesifikedutiwuzolonujavut.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/kevomidozorajof.pdfIn PDF document text
    • http://darstin.com/userfiles/files/xeguligimurada.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/33466430611.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/17345247381.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/1657088133.pdfIn PDF document text
    • https://eventaipei.com/upload/files/dimofere.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/65176658175.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5a09024c---mabuwe.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/77787169593.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/lugogijanosukudomilitulas.pdfIn PDF document text
    • https://webmenuplus.com/images/file/23739044594.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/wukoxowiwu.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/padasakaxejed.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/fusimagugivirovose.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/zazosarebake.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345aba0a51d---99577469633.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/26656472801.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/fejurogigusugekowuze.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/31818378819.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/vowopibukuwafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=statistics+for+machine+learning+book+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_off0000c554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC554 16556 bytes
SHA-256: fda7c9c54b74e7fc185c9deda7691ceb0d200b913821b6e64e5c693d0ec64559
font_01_sfnt_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 11372 bytes
SHA-256: 3edb1fc57111f7687a48b1a0b581fffa05ed00588bda3222339acd34d5580091