Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ebe3f403faf39a…

MALICIOUS

PDF

83.7 KB Created: 2021-06-26 02:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cad737e9dfd5cedeabd3ee90c34e264a SHA-1: a4de1eb8bfebdf8fbf042273dd37f16bf871ad5f SHA-256: 52ebe3f403faf39ac73b965281d84dcb581f9bf84e07b9c91f92b7749476bcb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish for information. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful sites.

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://huntic.ru/uplcv?utm_term=tuition+fee+reimbursement+form+for+central+government+employees+pdf PDF link annotation
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/77b382597a4562e66d1a025be9b18fe4/nuwogexekolizew.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac7f11971a---7183578312.pdfIn PDF document text
    • http://esejsc.com/upload/files/jetirikivinebozunagagadeg.pdfIn PDF document text
    • http://abpaluso.com/upload/file/93655957265.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607847a591277---10254670756.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6bc4aeade---25411167240.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/kedizojapibul.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe3aec120---kosukutigemofawem.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/50008a84b2f4a270e921f6ee3c7d4bf4/jejaresunutolodabofud.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/7d6accd592ee9d07e666d2e6600b9b9f/39427074787.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab8b82536c---52449985135.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083531787424---vibatero.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/50290532173.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/pawafopoduja.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/od3t152j08i9o5rvkpmq52poti/69411181162.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/jvpnt5mf5d8jjvb8m1kjoa5003/tipuwinup.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3kpaueeu3r793jfl5lheugkahh/76487577279.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021580431912.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/37a0ba1dd6b44e5d787c7d6a0c70642e/monovirakoxuvipedelunebim.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/16388332693.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb685f33b49---67153082797.pdfIn PDF document text
    • http://sushi-belovo.ru/files/xosobodisetibezetujus.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_off0000e452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 16424 bytes
SHA-256: 3fb2392d36022ad452e6e55e3d42fa044d4134ffcb4338258d31d0f0716484c6
font_02_sfnt_off000126b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 11348 bytes
SHA-256: fb456dfcd6a95e66ccf1302b3c641152d593953187b36ae50f9d54f4a80bbef6

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