Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d513e85a0cfd07…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 06:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4ce65a0110375cf48d0364854cf5d0fa SHA-1: 8611157cd70c759284ca60c986839930dfb422b3 SHA-256: 16d513e85a0cfd0701b4fc46312c83dc0bdc99591bc6f9ff13f2894361e49d6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, directing users to external websites. Heuristics indicate these links are often hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://wastran.ru/uplcv?utm_term=pubg+kr+latest+version+apk PDF link annotation
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/30120158825.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/50399250993.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/d2f68ded52ad867e999ca46e05719f40/zakusuwi.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/79283062374.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/wuxusutojijuvateso.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613dbb98f0b8b.pdfIn PDF document text
    • https://fultoys.com/userfiles/ruduferenuv.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161430bbbc7d0f---lelufixumugidalelow.pdfIn PDF document text
    • https://ghnservizi.com/file/dolotumixuxamemiz.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/49202758053.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/94429251168.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/58484878585.pdfIn PDF document text
    • https://mfdesign.hu/files/file/dogiwegeguposubogidoku.pdfIn PDF document text
    • http://irinabailey.com/upload/files/zapamenewikiviwe.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49384418296.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/fitusukununeduxowujufur.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613993b1da192---33058183624.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dhvn5bsm7nj8dc8csve4ca5tn5/65633857032.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8f2ed65c---2926130596.pdfIn PDF document text
    • http://intertribo.sk/files/gobexezofusididemuwexor.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/57988113252.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/nujedokafedowob.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/murenafigatejagates.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/jufurekolitopesisona.pdfIn PDF document text
    • http://ewtch.com/upload/files/dodajudemigolik.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b72938c30fd5e0e53ee52c3e8c5aeb5b/dexite.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/6630860437.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/56069667812.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_off0000b9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 10828 bytes
SHA-256: 73169e136cf1bbdb895534ba09fef1da2c743c2981c75657fb13bf15d61664d5
font_02_sfnt_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 16260 bytes
SHA-256: b9d40b01f51d16400bc419fb869e09deb536c222c26b48e47ddd37caee1da66d

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