Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c56add7f66428d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 13:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3dd6a9a1583f8351842fd0478e4a7c99 SHA-1: 6757f8da6c82661e06baa60c5dc9c1376caf1c45 SHA-256: 28c56add7f66428d37df4315eb03957328444ec67fc3e413f09c0dfed48b839f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary intent appears to be phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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 http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a3e590f2d---45181223386.pdf In PDF document text
    • http://blesk-stroy.ru/userfiles/files/kesareziwowodaw.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16097a5dfb2833---10037772456.pdfIn PDF document text
    • http://imi.vc/upload/files/liwagolilerawif.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/batizoreva.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/boxomi.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3b7c3d3e9---46550811409.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/43080341385.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/derivuduwemidasoje.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/lejekowunarujudanerafu.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/banugirogisilitowafekena.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607694a510843---rumagilotapufin.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e45d6355273057635603f482d89ffb87/pugamovokixakojuf.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/43282402760.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/de846bee240dc2fb72fd44158e2b37a2/fizowegotitatafijopuw.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/fefoforasofidokapuzawidi.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/7a4956fb2625dd797e3c4c9cffe8f5fd/27872469136.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f172de33b07---210935282.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608010218402c---tutag.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/19586469701.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/12473476221.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/35289726550.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d1b18d7ee---39865762476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=livret+gestes+et+postures+pdfPDF link annotation
    • 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_off0000dce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 18428 bytes
SHA-256: bc7fde138253dff896fd83f73bafa60f20533710730c5866aa334f1a885f5a08
font_01_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12371 10484 bytes
SHA-256: def4fb4cb46112b49cf8db14960173d17aae464b185c9a37c09b44fcf37abcdf

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