Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff87251bcc52a77c…

MALICIOUS

PDF

95.9 KB Created: 2021-08-14 08:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 903fe691fb4af9e9835bf880f4787885 SHA-1: 10157934bf9ef0895611e3d5d6d981f0c37ecb10 SHA-256: ff87251bcc52a77c7c87b655099bcb4c50c97cc552d96860ebb21487cddead76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of URLs with 'download' and application names in the query parameters further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://smidgel.ru/uplcv?utm_term=download+glory+of+generals+2+mod+apk PDF link annotation
    • http://mygotour.com/FileData/ckfinder/files/20210607_13AC0015C2E3925B.pdfIn PDF document text
    • https://morabia.fi/images/file/tomukusatilufogadol.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/danatevubatadugeje.pdfIn PDF document text
    • https://upaspor.com/resimler/files/jekozavekotopevujuxitavig.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b6bc0f9ea---kaxox.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/nukizujawojelonefuvowa.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/63085238412.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/gakasuwipeloposuritix.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/7iihnslfchplr7fi92tq5vfupk/bafixojojevazopefovofonuj.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e31e0bc32c3---xegugikul.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c53ce69629---27637390698.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160918bc8265e3---ninikasogav.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/hdbsatd8ji6uqkt245j28elah8/58923851322.pdfIn PDF document text
    • http://effektfilm.de/files/file/madajujowilidirazu.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/manonaronebunabutu.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/89444694736.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/86f57efd88988b528bcd15ed88a3f3ac/59600229276.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/70604955862.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9609eee93---jomoseretirolitomubib.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608067f2a784e---41452440199.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/182867fcd851d3ce0b57de3f76298016/16137361059.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 11064 bytes
SHA-256: 3feb9c1d9f0bbdaf0bc1960a30d131c192b294897735ac418dcf5fbaac5e8c37
font_02_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 1672 bytes
SHA-256: 3f1748778f03e7b7e2d3a6c88ca15ef060a02f224cd71155e662fde9dd4c56c7
font_03_sfnt_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 17628 bytes
SHA-256: f8a621cf34d148779a416fdfb5e9432185bbda85e87f51ae4bcb45bf3e4f23e7
font_04_sfnt_off00014ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF5 19124 bytes
SHA-256: ae49a78c7f1cf910a065eacb4bf312dd3867e64936e7ceb9500dd37bd0a34789

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