Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09da8ceba796ef9…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 02:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a20fa11809452a537b280e77dc801e0 SHA-1: 19aa9a1bd5ea88181adde4ec7df3e972532bef5a SHA-256: c09da8ceba796ef9f2968da05abf5644dcd53cbd9c37f5ff6af69402093d06bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to lead users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://abpaluso.com/upload/file/35121315304.pdf In PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64010a1cc---fuvitetebokiworavi.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/doea00t1sh7q4kuo33k0m2hlh9/donofomujo.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8357a6daac039c3e05a875e74bfefa9d/zinopasidijuza.pdfIn PDF document text
    • http://mousike.it/img_ins/files/wokososowamesun.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/gofupufisonakivajuvon.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7801bd4d0ec2d3045b602dd6845ad8fc/12405146837.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078944984a48---48047592694.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/punobuvonif.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ae7b7553ca7b93bd2a6386522f29b767/janovegivesowalu.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/wezemejavusamemajake.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/607e5659803677987c91a5255d206291/77932559076.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/nejexibuxokogoxoxababe.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/petososibabofitekuz.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/3974269438.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df73deddaa---54074620382.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/74197611072.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98ff65b2e---winigegegokanejopaduv.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/97818793780.pdfIn PDF document text
    • https://terrach.ch/file/jugupalone.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c39aa1c7618---10675232313.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/11681144771.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9a887ed9e---nesetitusasozov.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/br3tm6bnljqtj1va1nsget50ld/27006026337.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///76528598133.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e282655104---nigadajogof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hannity+and+colmesPDF 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_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 19572 bytes
SHA-256: c30faf0d36ca9ca4a5a291f9ed2231f36b61df6c4c8ace4206110665d0be9f03
font_02_sfnt_off00012b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B34 10536 bytes
SHA-256: 37c614e4f875f70caf56050b850ea3e6ac1104731d17b5a648542bba439ca93c