Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c2a73249da7bc9…

MALICIOUS

PDF

78.4 KB Created: 2021-09-04 02:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f0637ba90b057f9b56235d7036c755ce SHA-1: c400ca1282811acac486a49cd420eb2d2943f769 SHA-256: e1c2a73249da7bc9ff401a6997b1c443dd7e48ff3a3c6224c4ef100f462bbd2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links indicates an attempt to lead the user away from the document, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=bending+machine+pdf+download PDF link annotation
    • https://itracmediav5.com/ckfinder/userfiles/files/gitarurunetomadeliwakafa.pdfIn PDF document text
    • https://carlojans.com/cms/file/xewuzixolizaful.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/cbc93acb15a49b79015ac6182eeb9b4b/77777237342.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/6fef75e939aca5e39cdf10462a7f1ef4/vimimolatemog.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/gtl7hf83jla34hgn3v0lu5j956/namunususukonirokuf.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085cca823674---10662944727.pdfIn PDF document text
    • https://coluer.ir/documents/file/46067399866.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/rezamowanuzo.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/soxoxopujewotavepilut.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a58e44ae0f6---82617789785.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7spmosre7ks7dukumpuu1nb2u5/zinul.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/dubejularuxewun.pdfIn PDF document text
    • https://majubesar.net/contents//files/kesil.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/4580860654.pdfIn PDF document text
    • http://chikatere.com/Upload/files/75415095704.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/70932614172.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/radutawakunijizexebodina.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/kakofukusew.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/nixudefetiragiwozusanebu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2ea9d253---winalopavefimunur.pdfIn PDF document text
    • https://camelcarpet.org/d/files/85841247504.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/20625634805.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/703eccf28567bbf0f91ca341c6aa9456/82923434213.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/63361651762.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090efc090530---bafetebo.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_off0000cc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC79 18152 bytes
SHA-256: 7d8e6e7433f76528af7fcf55525868603fa780c6b223c72c82b40596203fff23
font_01_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 10840 bytes
SHA-256: 3ceed65a787505b7d56db7428518567ad6855cf3f88e1157e9bf4383ded5ee87
font_02_sfnt_off0001141f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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