Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80149bee62bb79f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 19:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82bbd28ed60913a67b1e7d39fa3e3889 SHA-1: 4e53eca985124dd27c3da6124644e47544c3acae SHA-256: d80149bee62bb79fc521f4fb7fe4472d33dc51247e3a05dfbddf44a8fca3104a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=3rd+grade+math+worksheets+pdf+free PDF link annotation
    • http://ecompletecontact.com/ckfinder/userfiles/files/3934881862.pdfIn PDF document text
    • http://emannsltd.com/userfiles/26700994838.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/bifasexofariwe.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4325au00peb3sp0i1renroq282/20129323228.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b9373ab54---duzusabokeweraj.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/nipexatejopoj.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbdcc5260---vagigagavegovokumomov.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/57110977564.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bc818de55---gazomixapukomu.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/melodu.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/wimutadotatopafuxukadedil.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dad68196e43---79879644129.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/4b2364eb268c247ca73781bded583840/72682775029.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2282305b56---worenunuluwixumuzinupuwe.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fa281d86ce1---rapawipepurovozo.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/61709635542.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2de27cdb2d---23724617700.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/7d676e96db0642fa717c96c47d7cdd04/zumagudomokovapuju.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/75619182431.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160879d9eaa5ff---73022767806.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/89306913617.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/74815264016.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610df0c316aed---96585947899.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/50794137631.pdfIn PDF document text
    • https://agatanorek.com/files/file/pezuliluvigilij.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_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 17920 bytes
SHA-256: ebfcdf3548a0c7887d41bbb2f749fd9df4d1edb6e92214b3b07c48f600fdf31c
font_01_sfnt_off0001089b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 10956 bytes
SHA-256: 8030a6432504bc1a23e1b5b188c17985b58a2cd011f1ae65bd511b0a67f98c75
font_02_sfnt_off000121f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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