Malicious PDF — malware analysis report

Static analysis result for SHA-256 70cf0770b365ff14…

MALICIOUS

PDF

73.7 KB Created: 2021-06-26 04:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f97856b552a4f82113f35a5bd6735381 SHA-1: 15aabd4c9393e55f44e7df2713718d28b198a081 SHA-256: 70cf0770b365ff14640703cc5683a7e73d4d7dfc33834e44da176d1711609474
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning tactics. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kanchanaspa.com/ckfinder/userfiles/files/dizalugu.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9ba6f4dc9e9f6f734e91c3ab867b198b/nitovana.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c5925856---vafodonerupilezelip.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ah4h3k1tdk5kkt4tvib193du0q/92715615560.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/57494dac6c01b2acf7390c4abb478423/viwegolu.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/lenarixagevamugutar.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pmu90acer597qsg56a36pp6d76/rexotino.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/57087441832.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/vezapotalabefatefigew.pdfIn PDF document text
    • http://www.moyekolodin.com/files/sosimumegubakewi.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/68150806377.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc7bddfdf---74096630265.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/0jirmsh620lrp4opsop3nj2dfd/19519425174.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/21977622510.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/45466528933.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/1051968077.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48c348f779---77297570652.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160752b0b81640---varuvikefaxupujapexito.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/mnnsmep4cue9vkknch7e2eb5bq/jexozuvikofajopibonunamu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/905972a35fc3622638c0ce990109d2da/29377985801.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/madakabamibipibe.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/8719973819.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999ddfe1b4a---zafele.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/427316c1ee102810e2e38b9016a2d275/retemanumatubeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=question+tag+exercises+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_off0000bcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC6 16580 bytes
SHA-256: e563ab0598f68e454603ac296592d81d0695c3912237f9c3eaecac73afd392a7
font_01_sfnt_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 11012 bytes
SHA-256: 4822991a1c2d269e42dea90e8462b946fd121c2555f26a4b0a6b0a550e50e4c7
font_02_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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