Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5fd527b826a8e5…

MALICIOUS

PDF

85.6 KB Created: 2021-07-15 21:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3c9d299a3f960b704716868eceff8a5 SHA-1: f1c76381d535fa6dd0bac2b3ebf5dc684d776864 SHA-256: 7f5fd527b826a8e558f5cb1849930f2777a440cac7f5408bcf89a5b3a773a484
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document's structure and URL patterns are consistent with a malicious link farm used to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://laborke.ru/uplcv?utm_term=palm+view+guest+house PDF link annotation
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/db44a106155eba0a58effa5c64654a51/jukojitopewiledoru.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/99473390511.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/jilalezij.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/30/file/dogabiwanebesumarolopekiw.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b074e03d120af97a258a78b6aa3e6b3/63863748974.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/wabolizobapu.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/93122563521.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/75417204062.pdfIn PDF document text
    • https://aashianarealty.com/file/3575045458.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d283379afe---28964231738.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b577a063c34---62771181715.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/dujiwimijufenisuguvo.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c8454dd4---68797308336.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/kakem.pdfIn PDF document text
    • http://0930actress.com/files/files/39266816843.pdfIn PDF document text
    • https://unitjaya.com/contents//files/romiludumegeduzeguve.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/83554509058.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/16628073877.pdfIn PDF document text
    • https://anfauglir.com/images/file/jatamisinuvutaleluji.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///2600338647.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084f57711e9e---97407736491.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/nlq82dica8316h1ttlqqnqa8md/wivowafelegobisogazekoviv.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_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 17088 bytes
SHA-256: ec1938daef5185e4a011b07065d6a56d51646be1d985365f5e3d91257c503e48
font_01_sfnt_off0001176e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176E 10604 bytes
SHA-256: 65f43c3fb3634a78e50cd4c4a818f6ca9f13eb245dc4e0e1ec6f04f4b7dc7d32
font_02_sfnt_off00012fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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