Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ca67d99eec04ab…

MALICIOUS

PDF

86.3 KB Created: 2021-09-14 13:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a24be1110755c3ff26b7ef80bd34c72f SHA-1: 21672c9af9fd20b38bc6eb5b1ccf522eb8e14322 SHA-256: 01ca67d99eec04ab1e094f888dafb8f917ed66e37708f04baf70552d9ad019f5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to various websites, many of which appear to be compromised or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' directly support the attack pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://wxmx.cn/upload/ckimg/files/202109060704001341.pdf In PDF document text
    • http://ziconiavip.com/uploadfck/file/xepasadakujexawukevajaka.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/34204034744.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/jifujikalaluzoteje.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/31035173595.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/t3b0f1rdg3bd058cfh16tfpjs2/80762777109.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135f28e666be---betiwujunoxojo.pdfIn PDF document text
    • https://empresa-venta.hr/files/biwopodudafetifuma.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/c579cba8aafffdc03eb7d617313b6dee/kikube.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/88830925322.pdfIn PDF document text
    • http://krzeptowski.pl/file/xezowulij.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/0frq87kfjdfcr0lv7390p3h4po/lubitokomed.pdfIn PDF document text
    • http://holcom-wd.holcom.vn/webroot/img/files/44667074474.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/doviferawemepazomiridugib.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/77083314193.pdfIn PDF document text
    • https://linardi.ru/files/file/66395760701.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/sarujanutezupawigatujim.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7ft8u3k85o2f1auhk5f2jqifk4/82110123401.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/29283238746.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a2dcae79643571b662c1fd381a647219/jagadakovuwesukuxo.pdfIn PDF document text
    • http://salt17.com/userfiles/files/lorevuzokefovebukojudu.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/jilatewugesimisaxemim.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/sixizoduvizo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1bd4125e---sarip.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/fuxozikavagitaxisisas.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/56796255134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=create+animoji+androidPDF 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_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 10356 bytes
SHA-256: 6c8a153c8d477e68b7814070537d659c75ba8abc6daf7f7b006172a025139879
font_01_sfnt_off0001068f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA1 17296 bytes
SHA-256: 94016844037ee72a567015b4fdbe22ca7bc10c21e7ff715b1093e668f21d5317

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