Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8c8442c8106dd2…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 21:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 80fc6b08b443db9ab63453f3a474635f SHA-1: c32a9212118c834a0f55910b8f586bd2dbeea27c SHA-256: 4b8c8442c8106dd2faeeb873a407442e96c7d9be61ede80e69ee0e9ff946cc32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, leveraging SEO poisoning techniques by including numerous links to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites for credential harvesting. No scripts were extracted, but the presence of external URIs and link farms suggests the primary goal is to direct users to malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=stanley+fatmax+stud+finder+instruction+manual PDF link annotation
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/2696bbcae2f0bcbbdefbd3d1c43ec3ee/88027084675.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/36981250379.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/342368f72ecae63b1816067f59f417f9/magosakedawaro.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/jesekuwazusurizenakinini.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/timefozubinivusegunumowep.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/22247498716.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c91f91f232913953a36a5166ee5ce0a4/86692131271.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/sepujolunejudovada.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/zenifajuj.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc74b150154---42229614041.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbb8c24d83---96142146540.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b724c576c3c---jijuselurofozeru.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/47025851514.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5d788c9fb---15485085085.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/40365531354.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/gifonikulotonunati.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/27797808028.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/mogokozofaregobib.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/petonerapalujelijususo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611acce08d20b---vifixelirakeli.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/oi36ofqn50pefpkkrmqlh852rl/fawatabora.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/eccc0b522fb34a64167fa53906385cd9/17848738469.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5663efbbd---gaxamafenovozomaxufeja.pdfIn PDF document text
    • 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_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 20672 bytes
SHA-256: 4a8e29e0674c42bbd3cbdbc73bff8010481eadaf54c3614d115f2ec40fe236ca
font_01_sfnt_off00011272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11272 11028 bytes
SHA-256: b23bbb4a0c0c3e9d780ae41d0a2d4338b1ad79ff9f166d57db6bd8086e4b900b
font_02_sfnt_off00012c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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