Malicious PDF — malware analysis report

Static analysis result for SHA-256 52880b05f80c5577…

MALICIOUS

PDF

92.1 KB Created: 2021-09-08 10:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5772ee8da3fd1ad4c121a28070d16b91 SHA-1: 16c7a405ac6d4c671471c040209eb3e540e02577 SHA-256: 52880b05f80c55779ae582ed95f5f56f755c2bf8f8c83ea752d63eb8a457d332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. While no scripts were explicitly extracted, the presence of numerous links and the 'link farm' heuristic suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/449de54a4a3ede2eeb9f09d68120f92b/gokazexexuvibejo.pdf In PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/71016607474.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe75a61a4---89111264200.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac8025015---79687255174.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/bamuz.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210709_45D8102CD60BDFA0.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1d92df2bf---70413797206.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/97ah30ort6umjdb9fiuqbrket2/beguzulikinikixavuxumeju.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021726247374602.pdfIn PDF document text
    • http://abc-tel.ru/data/File/5614879165.pdfIn PDF document text
    • https://airshow-bg.com/file/9552317245.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/34703616288.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf94e8f08---zumugevu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a75cb49b0f---3090460243.pdfIn PDF document text
    • https://mashura.co/userfiles/files/87518575232.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1627796706_43c3a0cdcc.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160708b43a1678---88845751862.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b113bc6c420---22138972295.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/lejasil.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/rupekilipegawuxopad.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed875dbb938---27966261245.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/gagatibogejibomiwuseta.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/vokufuzofagusugeg.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd82c98a1a---28639082358.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b5b1c84a912fb07a16a13713242b25b4/10540199191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lavastoviglie+bosch+aquastop+manualePDF 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_off00010107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 18640 bytes
SHA-256: 82ef8492fd3deda99693bf63b7b2289837307ffa7695e3a39b5a6d1e7f010dc4
font_01_sfnt_off00013173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001498a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498A 11132 bytes
SHA-256: b99b5750d1615fd3f37dd7a5d0a60052a2001d09399eee2b8116f74bc1a9d486