Malicious PDF — malware analysis report

Static analysis result for SHA-256 6605af5c51af2fd8…

MALICIOUS

PDF

79.2 KB Created: 2021-09-15 20:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42bf1a64b8b218680f64ca54674e2af7 SHA-1: 2b62359fc323b85547964d775749e5791497c85e SHA-256: 6605af5c51af2fd8a21412cb6af17db5c84715b748138716989e5905e86cfcb7
196 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests it may be used to trick users into downloading password-protected archives, a common tactic to bypass security gateways.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pixomot.ru/uplcv?utm_term=proteger+archivos+en+android PDF link annotation
    • http://take114.kr/FileData/ckfinder/files/20210915_41DEC73251BBCA29.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/73407890216.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/90174049088.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/50817753666.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/54920162905.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371ac08539b---bixaf.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/80690455944.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/5761097451.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/27644924823.pdfIn PDF document text
    • http://kgmda.com/upload/files/rolutagozek.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/gokumogoj.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/pilewetas.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/65815828418.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/korijeneragefona.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/firim.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/951931462c75ea21419b03cf4663ca11/rivatizibajonal.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/mukazonuwenu.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/kebupeletoxirefewukere.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/17837604627.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/713dc145900e856367bcf85c6002123a/12660717821.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/boduzonisirugunizuwubepo.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb3927f74---65232501338.pdfIn PDF document text
    • http://evola.it/userfiles/files/gafibewimo.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_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 10672 bytes
SHA-256: 46773d6c62dffefe8c70efe64a1ef386fd8cb450e035393c00710c1472073e09
font_01_sfnt_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 17516 bytes
SHA-256: c2c09af0af8ee88872bfd58be25f2f98b91c6e84b8ae32f7cd57f26d9c71f4ce

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