Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf6ca12579243de…

MALICIOUS

PDF

82.9 KB Created: 2021-08-22 02:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4b80e7ff4f3e2439413659ac611d3734 SHA-1: 002979bb420d983005e01c79987ff5569ea23280 SHA-256: daf6ca12579243de215b6b3dcaa47db899d87357ab140a9999e8c612b0bbe5c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://archism.ru/uplcv?utm_term=is+evening+primrose+oil+good+for+early+pregnancy PDF link annotation
    • http://landpas.pl/upload/file/tejemelulazukidigebik.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/3290d7b9c2a5e37e999e9fce48899ce8.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/bepom.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080213c1505d---95553762099.pdfIn PDF document text
    • http://unsersohn.ch/images/file/68910527791.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/kerofidadumituwubusid.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/fezekewudubavud.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/sajitaxazojaz.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/lotiwosebapabo.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d47d906d2f---lojomifefodines.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/bobujegivupinatewajesu.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/20134145622.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/e33f34624b066e1d7e916b1ea9b3f7c5/87158844410.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/24943246333.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/befla6khjktq92aqd850700gmf/fomub.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/19002489971.pdfIn PDF document text
    • https://inifd.london/uploads/file/12951220971.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/dukinivizemenurosa.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/d60a45ea579f80ae317516b27c515c1c/39860518909.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/tenut.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p78q4eqaqgv3e9fqnrfhk87505/wenowizovomo.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/nizesije.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5edd969b---vesas.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/78151232157.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098920f76b82---savidefutemirarozev.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_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10996 bytes
SHA-256: e27ddffab677e44f4914e3ec24ce9507a017025c78f545323985781e2262b081
font_02_sfnt_off000112c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C6 16156 bytes
SHA-256: e2d00ead16bac2f345f9c4afc866f747bc6a002dd71b6b1408757bf12193a899

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