Malicious PDF — malware analysis report

Static analysis result for SHA-256 959a2588cea2b4a6…

MALICIOUS

PDF

83.2 KB Created: 2021-08-18 23:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d33b15fecbae9fa2d80151925671a732 SHA-1: 65d0987d1c5dd436ea144fe9d645eb1e37ab04db SHA-256: 959a2588cea2b4a66d2b854347057acae2dc751e20084332407223a1187c296e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to leverage SEO or distribute malicious content through these links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=diferencia+entre+bases+puricas+y+pirimidicas PDF link annotation
    • http://vyveva.eu/UserFiles/File/sekuvumogowuwageneginoses.pdfIn PDF document text
    • https://strechybenesov.cz/content/mibajazarelifug.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf7858885f---37279752355.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/9085934790.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/6dc732455b7ffdae02df3724e6a0b221/tolorelusemibiwegoguguma.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949163673bb---76852551537.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/letq4no85k3nc3vps6bpgopu2e/2228087171.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/40825022480.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a69a0299e2d---76105098423.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/13dio3pcghgpdo4kceihv2oi79/83825172911.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/954f592ef9f15d97cb0753d01190d416/dodusolofufelodoxujetob.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce78f2b905---71973236959.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/xijonesitopajajozopak.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/vokutidizumuluwuzixepozul.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/xekavovagixorogemumi.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/96d17fda4d4f63c26af93bd8d671846a/jazidusubobat.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd6f8051d---36716598148.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da53f7c7f1e---7628235823.pdfIn PDF document text
    • http://adveotec.com/img/file/vuduregijaterabigi.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160878d7270448---zovamadebibowe.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/tewafivewabaruje.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/91158599581.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/60698821034.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_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 10972 bytes
SHA-256: 3055aeb50c0ac5cfeddf795529fb8698b09420170419b0b4c54f856beae1eb08
font_02_sfnt_off00010fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE8 17496 bytes
SHA-256: f578644c5a553ffacde9f13835f90c136b770f17b302c0f98a67c8a5d139d504

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