Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c98d1d306a8088…

MALICIOUS

PDF

91.1 KB Created: 2021-09-03 05:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: efd25fec03e3fe97fac8b497e1cbe64f SHA-1: 133c2c77ede7c6cbc525a9b55d35bc7a5efba08b SHA-256: c0c98d1d306a808822e18a896faf316dc21c8e989a11bbbc9bba3deb2f9b2f01
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a tactic to distribute malicious content or phish for information. The presence of a link farm on disposable hosting further supports a malicious intent to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://ceramvetro.net/userfiles/file/wopenober.pdf In PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce4395a1cb---nojivulisegow.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed410cecb---tajekekepopo.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/25527768687.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/60824499003.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/2eo95n127i9u2kpsjbv5jg0d3m/67412419707.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/imfr4och52k561q1igf721hu62/tuvesuzopupuzagonepog.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/64ea20159e7e2690f6c9508083482d4f/joxadetadaninevina.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/244464a70b9650f35810f7fc3980739c/87476630362.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ptbm3n9p9p7rkicrkahu4j1plr/16921126514.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607531b12909e.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/bc1f167bcf97a9e4dc2bdaa6bf3a6ea3/54283025827.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/88214017810.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/defdea5b9ed9b3e276b47a5c86f2c037/xopewanudagolavej.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/pevataduvaw.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/zokuxulix.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104494e8f6b3---96156354463.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/jerur.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/kazamejibogejozivowimo.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/14011541270.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/68296976616.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f9293a66e00---14955078408.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02194fc51---58624527880.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090725de7279---2571895433.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/0a1eb56ef84549d36e36eeb30a4a82c7/pazugituwuwawefibijame.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/54024338821.pdfIn PDF document text
    • http://www.520amis.com/upload/files/47860617782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=learn+turkish+a1+pdfPDF 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_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 22648 bytes
SHA-256: c1ded8d39900377363adc3d04613c933d5f569796dbb89eacf203af135af22de
font_01_sfnt_off00012df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF1 10628 bytes
SHA-256: 1135825968d0664872874ac5f831f1cc7330a7e6d7c52d1dad1f53e95a4b316f
font_02_sfnt_off00014636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1