Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d07b15cdafd6ea…

MALICIOUS

PDF

85.0 KB Created: 2021-06-29 04:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 08909982d8766fb1fee00016ae139c19 SHA-1: e3d035a3b09a8795f2b72c900e7839bb784b5dea SHA-256: b7d07b15cdafd6ea1203a45effcdc060ce211df057a0f0120d8516f3c203db0f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the classification as a link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe0b4f485---53270568916.pdf In PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/u6amn9fct8pbmljdaf9h5sstq7/lemuzufajarurezafomimo.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1588012ed---17651430712.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/nuzunel.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a9349a74913---liranezetosi.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a44f1d706---mamuluzefeselusagezuvi.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/xomerovunaparudu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a02f0d87a---bebepubasasowujuninakew.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/p41dhjv7sep9mcvf7hqe0oug0o/lorozutika.pdfIn PDF document text
    • https://bursaangka.com/contents//files/ralalanepetodewiwodef.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607133eb59080---36726822465.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/pfg1uav3i8mkq00rs2b4pt7c1a/torotokibakiwivanetezimuj.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7120b8949---vonivek.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/d1bc6a76d0c7u9ld07imm09q72/gasekasilofuvitokijaxip.pdfIn PDF document text
    • http://mcgrathpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rokojov.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc2112b782---5114628054.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/484365897006185eb6fefafc138299e3/37587514767.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/lofaza.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/fapixudizodavizetu.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/dijopigaluraxinozikoso.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e1746f6b2fbfb138c82c96f5627e6c8b/ladiperedubumonuruj.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f63a629c35---sebuxizej.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/i8430ogdos2466l1r62ohfe7s5/falojolisepegolu.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/15321866639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sl+blends+speech+therapyPDF 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_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 16976 bytes
SHA-256: cdbcbda6f176dee964cb00d50d455008889174374981e826c7edc61c39002788
font_02_sfnt_off00012e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2A 10728 bytes
SHA-256: c90927c1b6ad71f757fc4231913a74f8937a3e0b60795898b35e60e10c436f46

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