Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76bb553763f26e3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 17:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 869733c8a674526190d5de410aa783ea SHA-1: d3fa3cad9c9b72547a901f1cb05acd335a988ad0 SHA-256: d76bb553763f26e36a41564059b174a09846a15a78bb6beac4bf49aa62baa785
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 CMS upload directories. Heuristics indicate this is a link farm designed to redirect users to further malicious PDFs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via chained redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ou8moiou5nub8oorec9e5gm9k5/69910995606.pdf In PDF document text
    • http://zdrowejaja.com/Upload/file/xuwofip.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/sajovewebifezimar.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/76148788516.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/jatabakobeligulinilefano.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/worojawajokedagogob.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/mepusupaku.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/15189459329.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/9hev3lfugrcr6u8pnapt9a43ip/xepiranosajusu.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/suvevexadewe.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/sofanemewisokodopuxekag.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/kitusap.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941e3e41dc4---49837546864.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821bcb280b2---89885629527.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/wepuximid.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/dp78tfo82srmtk68nejt63l491/4602702929.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/35976840618.pdfIn PDF document text
    • http://cjatkinson.com/userimages/lumixenusarogowanil.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/tikuxaxutorilip.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/totemixofafo.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/97776bbebf62e5090f3465ae8aa04ca7/nibuxarakapugoto.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/mazagaregegixoxudegidoj.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/4mfolar3ogd2v0c41148ufcuf9/43801743199.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/domogureg.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f516cd70c---jemakikopetedawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=all+types+of+prepositions+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/dfed43b7f7394dfcf2e2cfcbd9ab4fc4/20044684310.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_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 10424 bytes
SHA-256: 096dd9f69df7d0b70fbefb8be65cb6e7e48893634b81525789cf1b21721bb4a4
font_01_sfnt_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 18536 bytes
SHA-256: 44eb7b8ece1bc84269bad0c1686e6790bbc6a6e08f795dff54028fb914c97370
font_02_sfnt_off000129e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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