Malicious PDF — malware analysis report

Static analysis result for SHA-256 58153e91b7830ac7…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 13:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 588e18fd533b1d8817e96e1903f9de1b SHA-1: d48663273ffeb231adf0565dcd6dc3777256d5d6 SHA-256: 58153e91b7830ac7d6ac211dbe338cb4fffc0f9e5fbbc1d3d3de7d45bb0b8df8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://auburn-properties.com/userfiles/files/lugupu.pdf In PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161124a1f6f6a8---munepikevolafegese.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607674966ebb8---62249867516.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/zamixekasobikokarimiwi.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/98561351452.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/38372267233.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/81217908132.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc0318b74d---midojij.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210903_8B4494676E973365.pdfIn PDF document text
    • http://cortabellanews.com/userimages/82006909293.pdfIn PDF document text
    • https://makenie.com/upload/files/55493966715.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/85056432490.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c672f62e46a6dd155b3d192eef5644a9/51703587912.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/jetukif.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/34845119485.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0201e9c05---76084609085.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/91416478925.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089ecb76ae8c---33990352493.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/8pkmsjon9vdmpemklmj6kr8ggc/23335831851.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/gekovebew.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/vewojejaporogolemugesaneg.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/80397828732.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/93832817846.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/jupijixipatowogirusabox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cara+gabung+file+pdf+jadi+1+filePDF 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_off0000ca29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA29 18240 bytes
SHA-256: c4bd4927b6cc1f3906cc4223787df0639c54f0390830bd022168b7a66766e232
font_01_sfnt_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 10740 bytes
SHA-256: e11020019afb8514f8c597c2ae1ce8fdca192a8f61d7419347e1a3e5a548e2a4
font_02_sfnt_off00011260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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