Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0dbdcac8963fefe…

MALICIOUS

PDF

71.0 KB Created: 2021-09-05 02:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c536122cac4643685f2c25ce1a77a50d SHA-1: f2fb0a7f1b7fbe9d20fd6ae3e66a83567c977a1d SHA-256: d0dbdcac8963fefe595e7687426ea45e2e999b2f37ee490f14351013b7d37935
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting sites. The primary purpose appears to be redirecting users to external, potentially malicious content, rather than delivering a direct payload from within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89ca9699f5---viweperemotadozigoj.pdf In PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/mamivobugekuwamir.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16087292249ad7---20845704904.pdfIn PDF document text
    • https://limsurempat.com/contents//files/67514969963.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6a1264a09---94290121984.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/lenivub.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/39147250302.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/sinudem.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/35058177378.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210526104400_gcc01u.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fd5b8c40c823af3630c4edc840e7ca2b/18318887320.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/mebutezedalurubo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8ea719f1---jisenunasuxos.pdfIn PDF document text
    • https://sadex.pl/fck/file/pamejopuxuwuloguloju.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/18730970561.pdfIn PDF document text
    • https://t2sc.me/userfiles/10565323475.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/48mc9vtmbpflu76vfa0tsdplv6/70735535843.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/vorido.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e572678d22---wusonefimasopuravegexale.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/zojuno.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/nudoferix.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/10761081108.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/jizajijidabazib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=basic+civil+engg+mcq+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_off0000b3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EA 16844 bytes
SHA-256: 8c72a55ca1b940887a976e464039454bc759c2ec757459b33fba37f9e36e46f2
font_01_sfnt_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 10908 bytes
SHA-256: 71b9ba9ddd21df39b955c5749455dab25b63464c2de12cb84a0db7b33434c782
font_02_sfnt_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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