Malicious PDF — malware analysis report

Static analysis result for SHA-256 08777bc3429f41d2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 23:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ba7a38b1453f225c851f700aafc896c SHA-1: e6c6f70c87fe0a79fea8a311a59d46f1e54e4099 SHA-256: 08777bc3429f41d2fb1aa943248098dd9cda3f4f943702dfd81ad673a046352a
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URIs, many of which point to PDF files hosted on various websites, including those identified as compromised CMS uploads. This suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://dobraukraina.org/sites/all/sites/dobraukraina.org/files/58930774608.pdf In PDF document text
    • http://h-st.nl/bestanden/files/66073775092.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/tisitezosujasedopag.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/nitupufirujipopoko.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86182960386.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210908_004909.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/pifosazenowuxoke.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/nemasamujata.pdfPDF link annotation
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceffb73191---16037778548.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6993950164.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/92913736705.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/fulidofafasigosomidurek.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e30c5d2110---pokiw.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/26577186068.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a0b1d91a---23179269708.pdfIn PDF document text
    • http://st03.it/userfiles/files/bisepoj.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/lekolaj.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/50933386027.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613599541b6ee---wakavewufijixidazabaruz.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/63988260326.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161339d1b34458---ruremirotisoxil.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/ladexew.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/30259476534.pdfIn PDF document text
    • http://ranch.pl/files/file/bagazajunifi.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/26303437088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=instalar+aplicativo+no+android+pelo+pcPDF 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_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 10524 bytes
SHA-256: 560b7e93117be5abd19aeafdda56ef44a4a3cb74644dad1c97f0af1b3ab0ed9d
font_01_sfnt_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 18756 bytes
SHA-256: ba0f1d412f4d7b6645787475310dd37fae3a4748aca05b9042079c7d973ceb60
font_02_sfnt_off00011f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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