Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbb603e253fb9c7…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 00:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f809682961f4359568cf0074352292e SHA-1: 8af53007b9cce44e501972146e324e69d61bcda1 SHA-256: abbb603e253fb9c7ab69a73b67116500502ce29995711d33b071515ec9d527e8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document's purpose is to trick the user into providing a password for an archive, likely to bypass security scanning. The numerous URLs, many hosted on compromised CMS platforms, form a link farm designed to obscure the true destination, which is often a payload download. No scripts were extracted, but the overall structure points to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16147a78234c44---vebopax.pdf In PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/75914600734.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/66352847557.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/92268450747.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16147a609bb13e---51590404717.pdfIn PDF document text
    • http://brukbet.com/user_images/file/39663489215.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/rimib.pdfIn PDF document text
    • https://kopari.hu/files/file/32442269305.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/rejed.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/gutowalemimezuxonuziju.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/rijozoleje.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/57103213511.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/tunikodefusamirujesabodis.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/3374957199.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/80888795999.pdfIn PDF document text
    • https://paperland.bg/uploads/file/27581439798.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/farivone.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/xigebubawazidatetutos.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/gebazujukirif.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/17931499712.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161343ab97868f---dilodotudux.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/vapejopag.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/wujigibadavefomarezoneb.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161413fde6e060---17218039143.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/misimuxibonadabexig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=business+economics+by+dm+mithani+pdfPDF link annotation
    • 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_off0000cb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0C 16764 bytes
SHA-256: e15ff3e66987c2739b801e0e15d5c07e75ee239717ed597c699d3a42d35992d6
font_01_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 11144 bytes
SHA-256: d8b7d697ae94ef2707585b0df061fd03636e4eac228384c76236c78ef905810e

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