Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde13e5a90ad7c01…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 00:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac41f7cd3a097ed03b2879833cfb6880 SHA-1: 56124b83f4448e56be2c8f331a8fe100c0b24437 SHA-256: dde13e5a90ad7c01311753de88afcab2cc3c0c9c992178bb87a6692953139d82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit user trust by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=employees+perception+towards+performance+appraisal+pdf PDF link annotation
    • http://tele-klass.ru/i/upload/files/dojerunomomixibawifo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b5f783a56---tipoxuw.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/33788580588.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/42258693111.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/zojijixovujinuwofeve.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/31310720331.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7e2e5c0b80ad7a7f0839c8d07efeff9a/fuvogakubudodiwebibutu.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/jivuvovuwanum.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160983150238a3---nomodetagexusezutat.pdfIn PDF document text
    • https://digicpictures.com/downloads/vegalerimapo.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/58961851730.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/37452464162.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/kumunisinelukakitozotob.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/likevuxumikawobenu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086e3dab846f---93670124521.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/degeninumapu.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/xatanunopuxe.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/469229101c8f3876fab4998ce2be1c87/xepupuraregogofafev.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/05cb1086c18be33d625175eb004c9f82/30627681444.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cbf87fe3d---bevemumogafavotisex.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9fb930617032ffd29030be23a866fe2c/36007845181.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/mununevapamugijur.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_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 10964 bytes
SHA-256: 125cf590441c7bca9f13b2d249656d139b22362922d07c6678b1fc0109207da6
font_01_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 17632 bytes
SHA-256: 2be96b39e000ef16289d6e04d94d952b546781df66f49b63ab248f52940b06c6

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