Malicious PDF — malware analysis report

Static analysis result for SHA-256 825300979b0d145d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 10:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a3ed3476fcb77f0a1c9574bb1035d1a SHA-1: cc8db206c52c43f0920395b9f277d393efe70661 SHA-256: 825300979b0d145d663723bdfd3236d251b173c9c01be5c1fcae9c2df123ed8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure, likely for phishing or to download further malicious content, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=somali+culture+food+pdf PDF link annotation
    • http://technoculture.cz/admin/upload/file/12957766949.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/te98skh3sekmvai3d9toa4qhs6/buwemikegax.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9279ae251---47271334633.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/d5kthfnitm65kilug550injpo1/13816792447.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/11948301232.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/786b8e638114c9e0fc100e098a113937/ridotasezul.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fb87e3b18---xenitexo.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c326c956b---49981114750.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b0526d84a---16159870089.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/rsmahrhdidrk5dqi1ibo1b1k41/89952833350.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2a6699ec4cc6d7b21bc8b74f2074f62f/kezuduz.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/nazomi.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/ximiwusolubanefavog.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder//userfiles/files/69267748469.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/wanolegize.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/nosiwununo.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/pajanigebizativomolavi.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/17716875092.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f684a617a---mufebelulikubapojoximoze.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/64019075965.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda27759e7---49975853592.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35b71a73d2---bakiwamatudomuw.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/73426080997.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/10538760937.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_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 10684 bytes
SHA-256: c8e43b4f95d068944a87980b8e3a995392dbfbf9e31b1e2b6c33ff517f6b632e
font_01_sfnt_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 17172 bytes
SHA-256: 0dd0ed0dbe78e12e79e845864b4fe082185fee5f9e2a8e49a5ba08fbe9a1a91c
font_02_sfnt_off00011c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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