Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba268ad28b60339…

MALICIOUS

PDF

76.7 KB Created: 2021-09-15 06:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73fec700c799101eb9c07123573e06f3 SHA-1: 9278ba02d0528d62c577e78266c11310500853d7 SHA-256: 1ba268ad28b603390ef966774a95e16ad4234f0db7da58002b2cb506c419809e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://coretry.ru/uplcv?utm_term=paranoid+personality+disorder+and+narcissism PDF link annotation
    • https://nurdagihaber.com/resimler/files/tusuxaxaxud.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/xotogugulugara.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109140437453452.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317b65c4c05---xisosawi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b947999bed---17188155210.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109080731439297.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613141a9b0cfb---nizalikasakelebo.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/xisud.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/58598538184.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614144097d8ec---pibazigigexetatukojupikav.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/88851748187.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/10089752734.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/55261212104.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/87716525346.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/wudelip.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/pewulomasinebit.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/numasituvaxolu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/52542c4cfa32c5eaa4a351a68d0815c9/69344033323.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/71851681544.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/61515708329.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/xujowopixumom.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/49301308944.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/3dugpl0afvcp56bahk25m4tlk8/5951024966.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/99648606583.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_off0000c73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73B 17500 bytes
SHA-256: 4c201941c8efbcb308c864b0f6319216e9aa822dc52855fba0a308343271618f
font_01_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 10788 bytes
SHA-256: 981f4248889e7e045d12cbe01e69330c72275f7586b8f120b2ba745fa999c11a

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