Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bef81482c1d70a…

MALICIOUS

PDF

119.1 KB Created: 2021-07-02 04:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0f738c4c204542d9e3af71c03a90b75 SHA-1: 9f5b4faeaed3a88d502ee6261a28ce37087a1028 SHA-256: 27bef81482c1d70a24a11d20323f76a2c69f47ac8e6f6770616f7e012beeef17
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=calorie+intake+for+12+year+old+boy
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859a1806a39---50921876423.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/d8f1c01090d80e79df818bd66559ae0a/rebuloma.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e8a4288d5---46691098004.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b2530daba82---47894687668.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/9412342640.pdf
    • https://samowar.ch/upload/file/10185108256.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/12cegjbch351s31p656m2nn33k/23681614522.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40de37c37---79885185362.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/22575924856.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/7519354bbeca0aa6d27643fc93fb5d82/10876017332.pdf
    • https://alexandrapanayotou.com/web/images/static/file/92010504852.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/j4kjtkrhqeh544a5m9fcrro2oq/wavupurituxejusejafoxaxi.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a95a27b1d703a50c47ca13e3753b3a08/nekakumilut.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb750870d---bubabavinajariva.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/27gvf9rmrhkahg7a5ivjkmm6a0/25792784556.pdf
    • http://szao-spb.ru/images/news/file/wixoledel.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/38ed5195bd2c9452ba84e7c4881c7ab9/83581818138.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7c0290b8e---87896465544.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b5ddc164d---tozegapajibesu.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607215b4e1e6d---jogizefaxusere.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae49081bdad---didatikitawupe.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/f127046ea4b3c9ebb2adb9aaa9196c5d/juvafujubevigeletes.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_off00016e7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E7C 16792 bytes
font_01_sfnt_off0001868e.bin
6c1b458b7624f8d0324f0666e0f766f4004b1b2bd242316c38bad20cd52f4024		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1868E 18316 bytes
font_02_sfnt_off0001b61b.bin
a6f25d0cfd076155072e6515c9bf35d77f21670a7cec5eed4e374612771972ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B61B 10728 bytes

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