Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0552d4ee2669ce3…

MALICIOUS

PDF

90.2 KB Created: 2021-09-21 13:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0d5288d49019091c458563a1016e8d33 SHA-1: 141f03e146fe429e4815de282139d3686bd901de SHA-256: e0552d4ee2669ce32f68bda10bc3ce91e70ad866edda3cc7cab39f42536e5297
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload storage, and a specific URL with a 'horse racing app' UTM term, suggesting a lure for users. The PDF structure itself is identified as a link farm on disposable hosting, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://coretry.ru/uplcv?utm_term=horse+racing+app+android PDF link annotation
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cc807c1a7---lifegajojozibejo.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210904210147.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145b7709e80c---84516432254.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140363f9eac5---67064550109.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146afaead478---52908271430.pdfIn PDF document text
    • http://gerocuki.hu/user/file/lunovekikaro.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8dce5eefd---mamuzajamepizep.pdfIn PDF document text
    • https://dienmayngalinh.com/img/files/79451459313.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/pibisuzonutagetowe.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae6a5b83c---71454037456.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/j9fauffjarmfag4h7al7massjd/76767135126.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/lodirizuzarumosurumim.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/dasotiraxejazaxifuzul.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/31344901246.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/xebilukolimajuvam.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gatokisiforodo.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/wopurabexemuguzas.pdfIn PDF document text
    • http://hflchw.com/upload/file/24771746405.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/77579398519.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/foberedegebilagexatapese.pdfIn PDF document text
    • http://abwrva.com/uploads/files/miruwiwemaperamukoro.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/41792647227.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/jofamefitaxapuv.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/19934193467.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/jufojaronelokujitulomamu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161441fe5454ff---95040009225.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/v16mkb9afv0h106squ9b69gnrf/63835524813.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_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C8 17440 bytes
SHA-256: 055fd6322e44ae0811af0abcc69526cce1ed093f3aa42dfc58d74fcf63f07058
font_02_sfnt_off000142f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F5 10536 bytes
SHA-256: d53e28f8abd3306c96541f9c29f50bf047421a81e5ebb0f5c49d34a17bff5320

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