Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7eea04c42cc8708…

MALICIOUS

PDF

71.2 KB Created: 2021-10-16 02:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5a5fdada703d9f276abd932805585f7a SHA-1: 2eae0d0b34406c6d89c13503675bfa00571df964 SHA-256: a7eea04c42cc8708bff12474465d67bcb3d4f2f791c72d07a906b3a8fbe7f099
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

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://pixel.bg/img/file/lowoxagezagiw.pdf In PDF document text
    • http://supportsite.myersi.com/images/e/file/20829243550.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/db3514ecdfed0c066464ee99811dc729/54758062885.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109090451125381.pdfIn PDF document text
    • https://www.renouer-auxerre.com/ckfinder/userfiles/files/91682084268.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/zamumuxedinutoniv.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/tafefawamunasudukepame.pdfIn PDF document text
    • http://dd-eng.com/files/files/56697037533.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/93523874551.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/komupa.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/63eef92b1ed35b96c177c9fcf1e4f095/dogibaxezolafesezupog.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/95746846136.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156879de1c9b---tunapusetojoluxapoxazoji.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/totobu.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/wubenimowati.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/zuxofigiwuwajo.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/66708176923.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///59838918640.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/65712083229.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/poxojomiselum.pdfIn PDF document text
    • https://sergiomauri.com/images/file/94993713794.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/piwanunudilerukavidure.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/EqozwcbAC44/uplcv?utm_term=night+of+the+witchPDF 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_off0000b66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66B 16500 bytes
SHA-256: f2c68c7d241ecd7136b075bf3465f28266180c6d6d64b5e9af5e76734830ff00
font_01_sfnt_off0000e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 10100 bytes
SHA-256: 95a60d3b2620840be211c03fbbbba3e30dba1dbd7ae82b35a70576da13e0ebc6
font_02_sfnt_off0000f7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1