Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc36306ec1f987c…

MALICIOUS

PDF

75.6 KB Created: 2021-08-27 22:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2eea238f2f8421e92fe18dfea0e34e46 SHA-1: 49098474cbf50a66bd7aeda585d15d35cc3d02b3 SHA-256: 1cc36306ec1f987c251c40e33e8ebcf33df92a7dc3d4674bcaeb3637fcd385ea
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised WordPress sites or other disposable hosting. The primary purpose appears to be directing users to malicious external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/uplcv?utm_term=candid+new+trends+in+chemistry+class+8+solutions PDF link annotation
    • http://amexeuro.com/an3_Uploads/file/9140396538.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6f8f2c80d79c311b25d4d69798fcf360/pajubivajezijusur.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/kisatawodubojopubigusa.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/46939262784.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/vimupuvedizejokonun.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/laxebejanafog.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083acf0d4222---63172939914.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2ca63ea16c018b96269f7783c54122d7/fogukipipugugo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076792df00ad---jelibamumusatujubofow.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608893f15038c---bolipupaputuwiroxexigur.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608996e1e42e8---tajawisexo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca06dae566d---66964352209.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/nepilenuliwamak.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607832da1084b---sixuwevuwepedajaz.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/19734299128.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/fexoxijusefujel.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da34077d23272c436793a10682e2e6b8/9066881603.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacd409aabe---38127308132.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4c84a5e9---607951637.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/sd9b49q8vdlkcrp5k481fnih34/vegilugugeru.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/70719301379.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f4f02077---45112141688.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/vofujawojivilulipuremi.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/tosagu.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_off0000c2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B6 16700 bytes
SHA-256: 81b62f2060e15a1e96a872caa6e87fd364efcf99cdc34bce22d297ce83250acd
font_01_sfnt_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 11176 bytes
SHA-256: 2e35e56b8b15f6d5678423259753af53ae3193be11694fe6385075270a0018b5
font_02_sfnt_off000107be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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