Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab787bbd2412ca6e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-23 05:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b45899937685fcd658a256ea80117154 SHA-1: 967def435e9672b44a1a640b3dfaa7f573e0cafa SHA-256: ab787bbd2412ca6e618e8a3143283926ccf7eacceccb6b5d93cbef141401456c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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=apps+to+hide+pictures+and+videos+on+android PDF link annotation
    • http://sumosushingrill.com/uploads/files/kitadiwos.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c8c6a05c1d1c2b79a6ebf75cf66060f9/kamapolitatopubedozi.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/72368717456.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/tupazowipuga.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/sd2qtr8obgkn04128s2o09nu0j/febixitebegos.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/bupotapasinuledolemalise.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/15f064b36aa6d6855b7f11ff57b5723d/bemugere.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/14982714392.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/toneripegewuwimududefed.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a05027685ad26e8b3ec35cd7061c8832/47200802022.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/cfcf4e14c197d46b8aeb463a7c85bc52/xedulojap.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/19757995600.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/21411485949.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0268a85d554fde0fb77dede331bf0145/26890219316.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/47369389059.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/nagutodo.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/36207330055.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/sobigiputodalarumoxoju.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132cb181af79---8996871349.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fb52a527d12d281035f64bb12436396e/22373675392.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/doxezawupufekum.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/dapizubaredugikisotekisag.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/kilojef.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_off0000cc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC57 10712 bytes
SHA-256: 44d241d8449485c1ddb39fa3c6bfa7a9ac1902c45e1371290a9d4a5a436167e5
font_01_sfnt_off0000e4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 18556 bytes
SHA-256: 521f5b2b85b288d9d8f7d5c27c660008d44b8d6fa310c5ef80a8938c10caa694

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