Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fcab80bbf56546…

MALICIOUS

PDF

90.5 KB Created: 2021-09-05 05:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 602518fdeb6f9c59d58275a2a1baa272 SHA-1: b6ab29b139e9b7d963e633178652651a804e074e SHA-256: 66fcab80bbf56546b125c49e7d8324a123d1f94dd365e448405d3739f9508880
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely using a lure related to 'pandemic definition' as seen in one URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://wastran.ru/uplcv?utm_term=pandemic+definition+pdf PDF link annotation
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b871fd35847376ec7f879e6ef8133c9b/ramoko.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/41945593992.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/16112067767.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/befefesagunevid.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/dda58b042c05a1e18f704d6200787826/gotejaregexunagew.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160748d4a53e9b---rarolawavunuresuxilu.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/75063654096.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/kuwabomepijevafarekuf.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/65834898732.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8c36e5cb2---gajumefasukagobe.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f10c424dc2---gaberigegov.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726f1cd427d---xetogapemovibamutijim.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/68649123195.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-20/20210820164517539541.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e20cbcc12104b79a9df317576a12e7e/45500517595.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/1cba9079bf3e174c8d49b8177fe07e8a/sixus.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/41284408935.pdfIn PDF document text
    • https://trexanh.net/upload/files/12271736073.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb1f064618---josuvufapusiranimodesap.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fd4f85998---ponowiresilumowagaxopise.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/posd77ngp0rhdgn036mrhn06kn/93665950216.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/mesivexenitatikisoro.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/2t2voo5u214icbqj3sdms9got0/64453123252.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/b37bc598f06dc49fa1d1d53d338cb18b/tomugifevusovedasi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 10468 bytes
SHA-256: cefb1c61ce54f4b44226ea18636aca47f02626b76eb21fa1254103c1ef5f397f
font_01_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 17644 bytes
SHA-256: be208f4290933249b272d48671578f93454bd692c9acf49a1fafe5b66032ce96
font_02_sfnt_off00011620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11620 17916 bytes
SHA-256: 58e7e953fcbd77c8845c11df8b74c9985aeb2d03079c3b0c63aaf499f054c1d4
font_03_sfnt_off000143af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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