Malicious PDF — malware analysis report

Static analysis result for SHA-256 740009588d8579b5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 13:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea2694718d8869da59233754327b4165 SHA-1: 7efc4ee206067dd3c7f9ab71ff70526c6ccdc98f SHA-256: 740009588d8579b566d8bb289ae31286635659feb7230f4301befec025501bf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable domains. The presence of external URIs and link farm indicators suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=save+contacts+to+sd+card PDF link annotation
    • https://pametnidom.hr/pametne_kuce/userfiles/file/rexixar.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/lafomanemafetade.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/36459758398.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/75246807756.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/17502285827.pdfIn PDF document text
    • https://parkettworld.com/upload/files/kabezajilofitipezo.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/85291883848.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/41355354071.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/mosigozutobobuzekezido.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/31678830475.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/tebepoxuzikin.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161423cb73994e---60583645258.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/kodufopabeb.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/xojaxozufuj.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3c2b35d55aa424a91c8d304d80844795/podiralaluvi.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/wiwomukuti.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161436d041063f---wiroguworufajopekujo.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/7616490258.pdfIn PDF document text
    • http://maihome.hu/admin1/file/lonitivisazakolumebu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/81995759236.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/54792841422.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/zozaga.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/wutagagu.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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 18612 bytes
SHA-256: 1ef43d756d8dc728b842990a1e92133a6b7310a9927ece66e3438a68afd0b90d
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 10364 bytes
SHA-256: ab3877912c5f8569a7cdb5403a4cba66abfa05d7e0e7a8a122fa4b4c8985f569