Malicious PDF — malware analysis report

Static analysis result for SHA-256 6581712a7e685134…

MALICIOUS

PDF

90.9 KB Created: 2021-09-17 23:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bd3b65ec3ef93826bc214b5dc9c8d85 SHA-1: 815875a3c79c99b2a20505ac664efb5587a2e60e SHA-256: 6581712a7e685134dce1de36143dbfdbe3c6e02c44c893e2dc5b2550fba341e9
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised or disposable domains, likely to facilitate the download of further malicious content. No scripts were extracted, and the document body was unreadable, but the presence of numerous suspicious URLs strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://comfort8889.com/upload/files/27444804139.pdf In PDF document text
    • http://bogaarchitetti.it/userfiles/files/mabow.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/volazedigigugevi.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/tasiwan.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/44702009222.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/48620272331.pdfIn PDF document text
    • https://bunianco.com/other_files/File/53280362730.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/99559246612.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/darusesefaxemivizizewir.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///wegafagijewelejalebi.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/45678891377.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/23238441785.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/81566234909.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/91615086388.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/6326q517ef3s0l1pde7tvtr7f5/bukipivasumasak.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/xirurojogomas.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e5cde8fac---kujopojotunojoxobapaw.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16693b344---mefebovad.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/14068705639.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/78158027860.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/93136342054.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614473baf0ade---61805079081.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/66589085208.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/xulilidurizalisutediso.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210905180334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=adithya+varma+tamil+movie+downloadPDF 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_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 17752 bytes
SHA-256: 018f2bc712dbb28355e42e9cb6838d9bf759306d1aa5e7551b85b5f269f84fdf
font_01_sfnt_off00012dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145EB 10592 bytes
SHA-256: 201d236aa7ece6c581eafde71f5f68d8b428362f50da8459c78ea681efe51421

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