Malicious PDF — malware analysis report

Static analysis result for SHA-256 7375204f4919540c…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 16:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76d10114e57a2574bc5dc55992c8fd32 SHA-1: 4fbe19875803116ccf8a06838da57b7559ae4be5 SHA-256: 7375204f4919540cb2eaa3e992801a6a2144d495930808be31741b37c8f3fa4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content, likely for phishing or to serve as a landing page for further exploitation. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.naraihillgolf.com/admin/userfiles/file/vadabikigaze.pdf In PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/0e2clujtdpt0m960r5ahq2usta/68030741760.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/337ea78abe0fcdc90e5428c3cbd10fb3/30528144375.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/g71al4428kaca8l9ns3on7dsmv/xokibejetugefewolafo.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4d76245fe795ab10dedb687be4a9beb9/wikataputakumur.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/a31826b4914bf81b30e8a8560f6cb4c8/95135450556.pdfIn PDF document text
    • https://claudiodituri.it/uploads/8155760481.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/19593403366.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/pejafusajaj.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f0c90e631d00190eb3da126207604c03/77319733432.pdfIn PDF document text
    • http://keramann.ru/uploads/files/88151973788.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161193f2259973---xuwukufibim.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/74592218360.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/xelazowegurezovimefunemiz.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/nofimebipo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4b2bjufeitmf5o67vhmmvp8mq5/85578679656.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/burajoxole.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160facd7184ed0---posibikalofusebewimuxifob.pdfIn PDF document text
    • http://chikatere.com/Upload/files/vifutiwiru.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae833494a9f---68474377158.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f193cf38a6---timip.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c30c94c1b3---6512396213.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/22734249031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=calculating+comparative+advantage+worksheetPDF 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_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 16908 bytes
SHA-256: a2d1538cb4d21c1800d06ddd19eeb1c6ac235e9c121d65a18eefa56cab4d73a7
font_01_sfnt_off0000fe1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1A 11336 bytes
SHA-256: 3445d2d6de705be1b0fce6953deac78cc88ab800af8bc507fcc009a81c09a11e
font_02_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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