Malicious PDF — malware analysis report

Static analysis result for SHA-256 03457fd6c03d0d12…

MALICIOUS

PDF

72.6 KB Created: 2021-07-09 09:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9689c8c5d213c8fb061f4012ad295dd SHA-1: 589e7b7d87640e6de46d825a9c6e6decd776e34d SHA-256: 03457fd6c03d0d1211f12536ee284a497a476abfeadd59132d1acda3539ab223
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links, some on compromised CMS uploads, suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://toromecanicorodeo.com/files/57318459458.pdf
    • https://gachbinhduong.com/upload/file/28790954831.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/m67estcu3h6gf5gshqr1tvclog/29137099221.pdf
    • https://jackyrouxmethode.com/userfiles/file/48525982394.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/f1cf6d80a190ca2133026740b81b0eb7/pepewibasabuz.pdf
    • https://roshindelivery.ae/userfiles/files/sebir.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/f9d2cea959209da7941997de8bda6413/robulebefabare.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073918fd5bad---88749003984.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/l1thd88gbc7bjmfo3vmebi58u0/87917295902.pdf
    • http://daiichibus.vn/uploads/news_file/10005303419.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9590589342---84664603379.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdac66edf4---54313961360.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160918caf5476f---27976665879.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/31b8e7eb3e971313e0510df5535ea22c/gogonukilifefizekagepuw.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/bj7a1btreaal4n8prlni8vfs75/15568043656.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/nusoxugipazef.pdf
    • http://www.hangmandigital.com/files/file/tupapoxuve.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/c074b82eda0c0129d32c57bfe6cd3cf6/11132734478.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/764bcd01341d23eedf28922cd6c13420/vabusogatitipafazixas.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/5e21f4a371e2b27276ffb5cbffc503c3/napupetamelokelupi.pdf
    • http://etenindex.nl/images/uploads/68281740674.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nsk05rleosld285tc9hsh3g6m2/fenojibud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=home+workout+plan+for+beginners+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7ED 16792 bytes
font_01_sfnt_off0000cfff.bin
a88e90178937260245b7667981fc780c1615a8df6f0f8ae195e056d286e6e503
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFF 16136 bytes
font_02_sfnt_off0000f99c.bin
8c433e7361e6bde4196096aa65c895266a9c4fd867b87898b101788802da25f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 11248 bytes