Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07aa9f375b8162f…

MALICIOUS

PDF

90.0 KB Created: 2021-07-09 05:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fab5a8862df1fd5a4105e335e0514eac SHA-1: b937393e23d1e572365e0418aba9ac5e278ee13e SHA-256: f07aa9f375b8162f18e71b74e92fa4832d48f23f12b79b3b65329e1a3078c01e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://bukharaatlanta.com/sites/default/files/file/69294575445.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9a242b66---damewirisusoroguwo.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/pi0l0gnlq41tudbusqmr31884b/gujuxagam.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/93ohh63uerfrojhcldcqaffhq0/pewoxozuxibesaviw.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/dt04n12vjcf061fngm39if6jf2/2307002811.pdf
    • http://synowka.pl/galeria/file/potatomafabunizopemu.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff3ff6dafc2b0adf95b7f11295c8d4e1/datadovetanabifijo.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c092010ef79b8a7e43804e519ba9a4f9/leluki.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160beb974c665c---27287005449.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e1231ca9b---28818167899.pdf
    • https://hgindustrial.eu/userfiles/files/72185131203.pdf
    • http://indecomavo.pl/inc/vibeparilenabuje.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cab65f76c---14016678176.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c781207f---84310285864.pdf
    • https://kultmotor.hu/images/files/kejuratexefudapodazi.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608127b615f25---nisonosudugizivipexizil.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee1e86fae5---zexewipeguzod.pdf
    • https://acgroupenterprise.com/userfiles/file/taredirilirubukurewimasu.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/8bd4fd72eb8c327134b9f1c5dcd7b982/24720412926.pdf
    • https://eberli-medical-supply.ch/userfiles/files/ladozedinupegi.pdf
    • https://avenue102.com/uploads/file/8961673509.pdf
    • http://gialtour.it/themes/userfiles//files/59203262548.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/99pvik9o4qrt2fh69lm5edbr7e/89994581999.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a007e58e1---javisaludalunesona.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ielts+essay+on+pollution+band+9
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e804.bin
2cfe271306aa99ed2adbd4c3554ce05949b8f7bd0b7cdadaa97b0dba82b01145
pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 10756 bytes
font_01_sfnt_off000100ad.bin
b15c6f1fd2303354faf610a93401c5c7dc698b80d2d358a781358d050539fab1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100AD 16788 bytes
font_02_sfnt_off00012c6b.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6B 16140 bytes
font_03_sfnt_off000141e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141E7 16792 bytes