Malicious PDF — malware analysis report

Static analysis result for SHA-256 d585c849983b89bf…

MALICIOUS

PDF

92.0 KB Created: 2021-06-28 03:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 850ef70920a86bbde670302eb955f9e6 SHA-1: 5a4aeeadf784b7d27aebf0e1447e0ab677e8f243 SHA-256: d585c849983b89bf468673ada76f40d1b50df443c86235fdc7ccd4d0ce99629e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://crewmak.ru/uplcv?utm_term=the+autobiography+of+an+execution PDF link annotation
    • http://cambridgekapurthala.com/damana/userfiles/file/kapamiduritat.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/ifg8qfs5u32al18gisll3r51t0/86956975885.pdfIn PDF document text
    • https://soechi.net/userfiles/file/47381970079.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/julifijo.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/67048056432.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160840cb15efe8---85677553151.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/935ecbcc1a24848f21c3901f0e5f97f0/gikudolavonin.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/sonivosefonakivelovapekun.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4085ce82c26f837f25d13aa5941e726f/22527314301.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/cfe6748a954ab562aab4290de0fb874a/zonokibodifite.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca25647d3---buwikiwofir.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811bbfbf83a---zigimekijofujuzuretifop.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e69797f41627c49f9d1c34849e64a0fb/besoxije.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/71507155076.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sazezaduvus.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-9/20210609003820892075.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85d695b1d0---2042045500.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f9ed24689---65485801317.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/27077231754.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9b4c4da78---juvofotanusov.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804ac72c5ba---pivazizet.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/33651051533.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b9d7f7b96706fb2c1505a34d055f3aa7/13726557088.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489d22c91d---kuvigufoni.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/1159608818.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_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 17412 bytes
SHA-256: b79a27d9edb91cab9ee8ac53943c4b51a3a1f5f62dd98600565772a381e39bfb
font_01_sfnt_off0001314f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14966 10964 bytes
SHA-256: e793e359113bc85ae42dad35d98514f9aea6770c35a476322138b682ce68c185

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