Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03b3f7e7be54e9d…

MALICIOUS

PDF

81.9 KB Created: 2021-08-15 22:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68ceb3a5e04601f8114ea8ab1524431b SHA-1: a18d575696b3b5094008927f87619d979846f6c0 SHA-256: c03b3f7e7be54e9d07c7e08e54a2b2313f37ae1765ba6aa905872cfe9e32335b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to domains identified as disposable or compromised, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://novichiha.ru/pic/file/76040898850.pdf In PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/99604085203.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/44dc8e5a7372a9945cced4eaf08f1368/bezetezarowi.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/gimona.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/17255116246.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/zadedoxebizupefan.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-28/20210728051419838075.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce35e094c2---teluwejaz.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/47032727312.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/k1kggrgp8lv692qs3d1k2vast3/komefupasapoxote.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610746d60cc9e---99420467243.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/gizir.pdfIn PDF document text
    • https://teddybestore.it/file/35940784279.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/70485737337.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/keselinobawudifelevirowu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082895f81823---92402089123.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd4eec1aae---nitigafalubulirozuwuduku.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/43107968160.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7ea43082---fusemapixijewokubuterezat.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b09a6d91e5---fasor.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/70409654550.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/87487421631.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/39285187413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ejercicios+matematicas+segundo+grado+primaria+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_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 11128 bytes
SHA-256: 3ae32a9a53abb2f67637494e45005407910c0aef29886d7d279a8fb16de79451
font_01_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 17528 bytes
SHA-256: ffe829114a5318e448469f294e82e5ac4ef0591b0ea3d0398801e19dd3ed1550
font_02_sfnt_off00011ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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