Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c602100517800b…

MALICIOUS

PDF

72.1 KB Created: 2021-06-07 03:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e9e2b76017b96bebd413912c9e9ee0dd SHA-1: f59e6f6eac8fb791d3fe9f6019248c1c7057f8ea SHA-256: 22c602100517800b0f79e12bc5a2651773fa1e707cd5bc29af1912393657aeb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phishing pages. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a specific PDF title, likely a lure to attract users searching for that content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=calculo+diferencial+samuel+fuenlabrada+pdf PDF link annotation
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/cdf76eb5157fcd41b1a34571c4a89086/legusowakik.pdfIn PDF document text
    • https://akbaturgame.com/calisma2/files/uploads/reredibibikagejiposegopi.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da3a48ba7a---rukowebomesunigamigifi.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/44961210820.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/xovez.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4d01c54b---83637911193.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ac3ef78a73bdab32d747d3a2a780b56b/dopepunalavatejofilulav.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b859c19b485---4545392890.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/f0c2bsl71mbohefvofdnk9ten2/kimarafefoba.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/80863305087.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/guneputofevipalujiv.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085a21541b03---61610728306.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/39646789210.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a99e2f8df---24996680548.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a9df973f586---9058208051.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160756e5a898a0---wefagelagopinalu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/buo662f3e3ipd7av8dngm9cm66/63578686582.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16083f10150315---wofevalujagavuriworoz.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/putifabeler.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/95442e8a1c155366a39c63b889bc0b98/wugeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 5344 bytes
SHA-256: 9a585ac7172f7e1a13f926e2be1442d8b6923c40d6a3f8b57149ac6b12c44d9b
font_01_sfnt_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 11296 bytes
SHA-256: 00004d091b79a1a5d3d3fd35852010f8bdfcbfa70043ab215bf34fe09461af42

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