Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b920a6c3019132d…

MALICIOUS

PDF

73.8 KB Created: 2021-09-15 14:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2aae187d78986c132096f48439e931a SHA-1: 28da1d284e8317cf5956843a135a0cff6d964bd6 SHA-256: 6b920a6c3019132d5c835667f77a2e8e2e809c33b3b2990243d041657930e930
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. The presence of numerous embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://laborke.ru/uplcv?utm_term=night+unit+plan+pdf PDF link annotation
    • http://congtyvima.com/images/Download/jebebizasojukaf.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/66163696179.pdfIn PDF document text
    • http://tid.vn/upload/files/nibizeserabukevawafexuja.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/59362786808.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/kkij65fqt27h68ak273hl2d7e5/96603374676.pdfIn PDF document text
    • https://sim2007.com/files/11942023412.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/82322754834.pdfIn PDF document text
    • https://tckontrola.hr/files/wafizudanogixu.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/sepekogo.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/vuwitujutap.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/45215829864.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/bufeziwobakivenu.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/47570306927.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f75268e9af---fabogenozivige.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/56020155680.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/89733087908.pdfIn PDF document text
    • http://risme.vn/files/zibine.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/varuzizasuwutavozi.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/neraminefuzela.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/sufigoma.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/72065936785.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/xiriwuwar.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/bc23766e3745eebc8cc18934aed9b7f8/84271765915.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3ca8e24c95275551f048ea3f7cfe0135/xugisotuxamigiju.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/58717879091.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/28645939761.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_off0000bdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBD 17372 bytes
SHA-256: 7405d323396473567e9aa5599c0a899c9c6708d4db7cefe8d33b302f9c4cd1d9
font_01_sfnt_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 10336 bytes
SHA-256: 3d35985b677349702fe9fddf004944e114c399acf633dfb08636c33c0aad82bd
font_02_sfnt_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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