Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cbcfbe0f9d9444…

MALICIOUS

PDF

86.7 KB Created: 2021-07-14 07:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 162e3b1794d581a9a35b5c6511f2546a SHA-1: f22f4059b492205b916695792f45f859619f105b SHA-256: 63cbcfbe0f9d94443a200c9a1ff12d4bb220e32e3a9675419410ba5b4a1937ec
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely serving as a distribution point for further malicious payloads. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the true origin and distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://box8websites.com/ckfinder/userfiles/files/magefad.pdf In PDF document text
    • https://bywuf.org/upload/editor/files/pafulijomilusoj.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a656c72ae---17983138707.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f2514b1a6acab6ad1ef493ed5e462079/jolovorag.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/lufizelonokikosi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c74ebdbfc9---51632051828.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/68783110774.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/sigoralugusukaxoguxono.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/mejerubifozogi.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/gowajomaredevofatujo.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/8be622aac31012e1d27c3fdf69399a65/xubexebelopebezagokutasog.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/momuvokitibadelenige.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/dujavovofipetot.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/76430128562.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210707153020.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/59428057883.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/98891944993.pdfIn PDF document text
    • http://4bx.pl/public/file/15470963880.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/knek6r5ri1uhdtdafdq9f3b5rb/dovitifamedunetinuturifo.pdfIn PDF document text
    • http://gonuldoviz.com/upload/ckfinder/files/17600999636.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/81317867131.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/95b3ad66bfd977c9201441724e161a18/65803296501.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/1621541147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=during+meningitis+which+of+the+following+layersPDF 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_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 17308 bytes
SHA-256: 92692ba80a58052b0615e491a3917712a7cead7ba502f6eded1aef46912083e7
font_01_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D6 11084 bytes
SHA-256: f408a4e18b5d1672404b7b9e490eee06b782dc327ace26b6be3be3b8dc835c6b

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