Malicious PDF — malware analysis report

Static analysis result for SHA-256 a658759ce0ff339b…

MALICIOUS

PDF

89.6 KB Created: 2021-09-01 05:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d0b1ed0c60984f1ad5e0470aa7a7849 SHA-1: 9a1ce5ab3797e8c674681866ed8c24758cfc3dda SHA-256: a658759ce0ff339bd7b789f658d795cdeac9866d528e782123ad8acf1bb45084
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=camping+and+backpacking PDF link annotation
    • http://aarogyamedico.com/userfiles/file/45209226126.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/61378990831.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/72430750772.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112ea441915e---wunolebexerasepudonizenez.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/10834192855.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/45874013359.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/xuzav.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/fagiriwavozixusew.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/vodaxutudiwalofi.pdfIn PDF document text
    • https://goodline.by/userfiles/file/lobajelunokotarukebo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98ac8d9e9---76854855000.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/vizonidilurosoxotipa.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071736c15a64---31734307100.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/nematebenejajotomivonar.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/dc2113c3c7bb6064930a1af5f05d9522/sinix.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4e560720---74993429404.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/df44f0f3d982b23342abb1eacaa5d343/gosatugusif.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/fexutunaziwozuneroze.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609748fe3e62c---zepub.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc749394ccf---zenigatab.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/45616001766.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/kekiriwido.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/zexonutopovojeso.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_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 18860 bytes
SHA-256: 3a29267654f572c481ddb132bee985fe57442482e051fbc73208d9c0b0decaa1
font_02_sfnt_off00014072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14072 10456 bytes
SHA-256: c55af7ab0b00a132d6f83a3f4548cb05d1a65c98319c774fb03abdc3489a0d21

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