Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01a9f613bfd9759…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 06:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5db4ba34b05a0339bb3c59f669e946f9 SHA-1: 2bc3545d8c15ecc4dc1e2553e9d8facd51e29f32 SHA-256: c01a9f613bfd97591bac3f561deb8599db99e1483b330f454908f8b8ff6b2d60
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb67271912---86977848835.pdf In PDF document text
    • https://sport-jicin.cz/dokumenty/ledeviw.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f851d2cea---24356046021.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160854e9422d8e---benuvelatikuwopepulevakun.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/29572577000.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/15116336852.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/61ae38251bb997e6d684fded3ff99d43/jepuvimare.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/lelowis.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2c5e5f0eff7fddd96c9c4c749b939b69/vumarunaguvulurabana.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/77339mt63ae9bqlu9d8v1h7vvm/zogavasuxuzisilir.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/fbad9bc79cb03ae17abbb6b6dd7bf654/rupazosigagogamarerefeko.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/5e354d287a3b4a21d27c2086d39c347e/nesujovenewevajinaw.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b7a76cdd7---26822415692.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2ahvd7jnpn3u2ph131i6dveqep/ripebijoretafolegebalenub.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/miredefibanemuruwolefijo.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850cb63931a---87219295191.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6c8d107744ff3416c925c66d21fc1943/luwijig.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608a34c2977e7---gijoseduxopepiru.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/19816826655.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/bab9017323537d26d1e95669f798f551/24403735968.pdfIn PDF document text
    • https://lecapsuledigian.it/file/lefoboregosirow.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/22ed79d327f60398a603d1b65725ee1c/genibiboxuso.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160751e7b98cff---rolenadapaxegitavovuwaj.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce14ba4b9---93578912590.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4395ead2a---sofebelerawipakesa.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/61153739535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=indian+passport+photo+size+in+mmPDF 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_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 10624 bytes
SHA-256: 9528a767f6a021830cfe30be8e3ade65e550bdc1fb70b7e073e599e27ad8d4da
font_01_sfnt_off00010acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 17336 bytes
SHA-256: 80875e1c1d151af3ab8fae3071b8242c2beb68c36996c88f1efc7cc82c1055ec

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