Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f9692942529add…

MALICIOUS

PDF

88.7 KB Created: 2021-07-31 07:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0029bda18ee89a81b72a3aab1c0e0f3f SHA-1: bc591b93c999a5377e471d0953bac1401a6b4a96 SHA-256: 24f9692942529add7d2fb16d8ddcbefe044d22ee766f8a3cb0b84b5bcb9e9c3c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and link farm structure are indicative of an attempt to direct users to malicious sites.

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 https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/dd220d4e120df855c98ea2f4bf31d114/pemasijivivotekojitonase.pdf In PDF document text
    • http://xboxheerlen.nl/userfiles/file/buzigepegolawijo.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/54458297762.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/ruxonusexurinaz.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/d54s9rpvd7bnmc23ae3avsamv4/fisem.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/wunagufezutot.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9c1b4676---mekomunowakivutixib.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xulotasesadiwe.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/zujusidasikuna.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4848e5b36---10872362333.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2b38ac142184ccb2bc5f0f9abc7d5f1d/jibisizasowevikotut.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/kakujiwu.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/r3a6u1870nhehmbs1vh1o5k2bl/jitelaw.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160beb9e8b7873---55480490472.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/6393064406.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2c1c95437739f7e9039d21f48c9e0498/11913904033.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085990c00d7d---47685028286.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/19259632511.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/162a575819297f22318ee6856fc97a87/87690672.pdfIn PDF document text
    • https://medtek.vn/storage/file/namuxe.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/17529367787.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/dotezemebubopewanik.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/76751683565.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55ff02606a---58569725671.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59f1600df3---jebilibexolazodin.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607593f88188e---pipuzalop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=crossfit+program+for+fat+lossPDF 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_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 10496 bytes
SHA-256: ea34c78a75eccd84710d3f3de33bfb6a8cd7ba03f8cdaad7ebd6ecad97e0f00f
font_01_sfnt_off00011260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 16368 bytes
SHA-256: 02e0b263f478f641e0980e690e77163a8b1884043691b68b30061ec4fb93983e

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