Malicious PDF — malware analysis report

Static analysis result for SHA-256 40546f61020f392b…

MALICIOUS

PDF

95.7 KB Created: 2021-07-04 02:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2756ef4239989dede67425efe217b216 SHA-1: f62e944b34b68ef45554b0dbe41ec2bdee665fc6 SHA-256: 40546f61020f392b30b18988a28ddd3fd491aec283320bbb3ea8c4fdcb85f6e5
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 identified it as a link farm, with multiple URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve as redirects to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/62ff362e55f1662e7d7f6a582f49eed8/44246205453.pdf In PDF document text
    • https://alajuusa.ee/media/contents/file/84942954950.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/22712209044.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7b96e5eaa---66475055616.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/vibere.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609530eca2e1e---74844041904.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed41ca12ab---87580827692.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/3aa1837bad8d581b0739b30bcfb9ba15/57520805123.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/2261149499.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bea09e66c0---safasuworo.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/472045a32c191af3de09c8d77b0d19b6/27132843864.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/eqbg2m5l52quj4699hfqmmhdeo/pewemunagetoboz.pdfIn PDF document text
    • http://erex.hu/upload/file/xininalalipojojupopite.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/pevarugudo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48fd5c044f---fuzakavan.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/38234480660.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da33f9ab45e---28940256865.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/71455633343.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/8018809485.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a11547d263---31478181129.pdfIn PDF document text
    • https://agatanorek.com/files/file/tapufewofukabiguwirajetap.pdfIn PDF document text
    • https://chp-travel.ir/data/file/33868850639.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a1b44eaa---4975617741.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f2e28d19c---puripipomar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+outsiders+pdf+full+textPDF 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_off00011449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11449 10496 bytes
SHA-256: e16b856fa2c3f852e5a27c1d69b4cf3ee41d34ca9962c6742865d93cddbd8581
font_01_sfnt_off00012c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C47 17372 bytes
SHA-256: d30f29fe67319640e297e5ce6dc68a314d72588764ee455cbc50a8d9186f8dd2
font_02_sfnt_off0001597d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1597D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1