Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3180473bdbe873…

MALICIOUS

PDF

113.3 KB Created: 2021-09-08 06:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e8d04fa31407c0005cf2ccd31f1bbc3 SHA-1: f42a0064d5da492c4e538824714af30d80f57617 SHA-256: ca3180473bdbe873d336c8f2b8b00cfa83a2d9a1cc68517462b3d86f8cdec44c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to be directly executable, but rather serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dietmoiquangle.com/webroot/img/files/89759829225.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d903f53a7c9---nepovexebijufagudiji.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/4lhqu62k9dqgmms93bo6uqlmu0/30121102356.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/sobesamoviwinakofazasi.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/93235944811.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/vajukanoxunubuvama.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/560ef3d4baf3cfbe37f0732afce42a24/vixudekigekizovidosebo.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/85738949605.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/0b2c7sm34dv6lsn0jhunl60gcn/xixapenisatulofiwaku.pdfIn PDF document text
    • https://bhavalaya.org/ckfinder/userfiles/files/83974893736.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160801adf7ad6c---32987021233.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160946f4e232f1---22135760772.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a47df66fd65---livanegafizodibevebe.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2bc2f4d5---tamowederi.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/89302426792.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/vugeterenev.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/46111575306.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/28002141318.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/3nmntocdncd1h0r4ffsa536hs6/6423692312.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/20ee9a1ced42710e6fa6ada2c9e50151/6612819841.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/86391515113.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/5548323637.pdfIn PDF document text
    • http://cochemical.com/upload/files/1771763496.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/fetujinomowef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=esercizi+analisi+del+periodo+pdf+con+soluzioniPDF link annotation
    • 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_off000156d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D3 10656 bytes
SHA-256: b2f37d6da83f9f992d810a93174e32d5b267e1db93bb232b55830633603158d4
font_01_sfnt_off00016f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F51 18188 bytes
SHA-256: 4a3407fbd8ed2406c6813128585136939c279b0479084682a91ea1f0b9c09c43
font_02_sfnt_off00019f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1