Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a90ce6914068ae…

MALICIOUS

PDF

84.5 KB Created: 2021-08-06 05:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e2c51f7f781f6d19b8475d4617fda14 SHA-1: 09dd89f59e960504962ba2386acfc4cf31bb5c2f SHA-256: a7a90ce6914068ae3bbeacec2abafec1b1dc3f9ab16714a2139bb2dbbe0281fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests an attempt to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://allytemp.ru/uplcv?utm_term=que+bases+nitrogenadas+se+encuentran+en+el+adn PDF link annotation
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1621683813409.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/65522051894.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/vokukeg.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/zitefitikubaxirowikepowux.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/mipomanimamenixizilip.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ecac31f50---71252852964.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16100f65d7dbb9---82305753378.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d54b1fc4---85975006071.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/jojebanojag.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/luniwogemotalobabenilo.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/39566599325.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/surowuwunexolaf.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6addfb11---texejimefa.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/bf27252ae1c4ddfa122a0621de4d3ad0/tugemilowonifemokevum.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/pnp1cmnavb2nj4quqihogpa0qg/27635986589.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/tobifufowe.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/dd5d0d1f9572d396d52cf39dbb9318d5/kefevimaloxilapiroxit.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/0dolupdepo6hmkfd4q6cmm045q/84902934681.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/33105014544.pdfIn PDF document text
    • http://brune-schmuckwerk.de/ckfinder/userfiles/files/52885791574.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8a29f3f0---77423913408.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099578447524---87707288644.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/gibixisogitogamasovezi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD2 10844 bytes
SHA-256: 3f0b95b89957a30fefa49dd934669dcade3ac8827482b8efaf9151c5119065fc
font_01_sfnt_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 17472 bytes
SHA-256: 18a68c2a845b2b20960f240f75458e1e43081d0b0c212ce60178218bd2ac3e7f
font_03_sfnt_off00012db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB8 16092 bytes
SHA-256: 98bcec2be85b547d266a48c61dccc50816b624367bf69e2f194f2b8087d010f5

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