Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfcf6beb6fef447…

MALICIOUS

PDF

139.8 KB Created: 2021-07-02 16:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3ed175f4111fc672be31f150e808e5df SHA-1: f05c14be9ae4ef45bd9334b8da4523bf57b5619e SHA-256: ccfcf6beb6fef447f1c69755ec8d825596a15824470a58d9afc8b303e4c5ad59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ac38bbdeb3b4a5c9ded86480d3bb52f4/silaboromogikix.pdf In PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/unk4q3dqqaus6k76akrgd12cpl/lorot.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6964410deb---zikotibora.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/60671239446.pdfIn PDF document text
    • https://lecapsuledigian.it/file/woxidexanoxoxufitif.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3eb8d36f---1798920808.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d50fd151d65---40171349967.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6ikj050ua278099t1obif10vo5/51344804644.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lusefepovivedijawivisutuj.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977313006da---mowezerak.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/30637811615.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607125c869f64---79148653685.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/segawedamiluxapo.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/tuniviw.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d315c62077c95acafabaf76ad6486a32/9137822128.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/5cc3a7dabc5af15b1264b91e57de3960/jigidupubekogipaxiwoxinu.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16208004388185.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf4a45e59---67829734751.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/10leqfib3rjcid5nutm6hdimfg/wilegimugawamuxesanag.pdfIn PDF document text
    • https://tipresentoio.it/images/file/bujavofifowerapito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=american+film+and+society+since+1945+5th+edition+pdfPDF 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_off0001bbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3C7 11412 bytes
SHA-256: 1314c17c94ddcb743cf6183c1744813241e1906a40b538d4e531fa4478d48147
font_02_sfnt_off0001eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EEAA 19964 bytes
SHA-256: e21c91b6d73e406dc7cb6a164ac6aaa6bab68efa855ab1ebd66d7b0018c699fd

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