Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4a821c1a3c447f…

MALICIOUS

PDF

101.7 KB Created: 2021-07-29 20:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ddd1f0e674e2f75434dee3e9233d722 SHA-1: 7e06ebbfa05932cf44388740f90c1d4bed52bff0 SHA-256: 4c4a821c1a3c447f587fc0d0b4eea368bdfd94800eaae9a62e23fe0475d051b0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=project+dashboard+excel+template+xls PDF link annotation
    • http://maychamsocda.vn/images/userfiles/file/93473955479.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/69865198673.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/nugikadafagixutotixuxeta.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/58719552476.pdfIn PDF document text
    • https://avvocatoboretti.it/file/28332669420.pdfIn PDF document text
    • http://cissi.it/userfiles/files/43084764465.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/42147979547.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b9a07e58b---87918620808.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4127ccde95---geresilafumidevidulusam.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5a9284351---lepoxijomuxelezo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e4f24b1f---48787588053.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/4627084616.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b684dc3374---88535343714.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/67049235598.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d981d85fb---gapavabu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/tirigezovibufexubesel.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ufbl3tr769n739fu649dkcpi23/60517479784.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/dipugerederosafu.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/831faee274517d924a07aff93bc45c3c/vamedugaserumezawosuk.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/rk8u72rstje5j9fbl6ta7fsp78/sudifavubeg.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/vapagusupifobewux.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22d4da3c43---42729700482.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/58461529521.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_off00012907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12907 10956 bytes
SHA-256: 131a7db4405ccb785f65fdbe5c13e49f49613c5d82d6eb6a120c8ec6f61f142f
font_01_sfnt_off00014249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14249 16844 bytes
SHA-256: 891517d444963be463de4706427ba120244e03a3ea8c396ce166de79637d6ca9
font_02_sfnt_off00016e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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