Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60b44bd501fbe71…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 15:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bacea3a94c81e7f72af6a758ac83b95b SHA-1: 7d72a174403d88da308d7cf2a2aa66422db923ba SHA-256: c60b44bd501fbe7134f13c6d254a8a67f95c56ac09956218e711e7d663691eed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting. Heuristics indicate it functions as a link farm, likely designed to redirect users to malicious sites for phishing or malware delivery. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.truckersplantparts.co.uk/ckfinder/userfiles/files/riran.pdf In PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/18744732868.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109120631142983.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/11456796668.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/gigifozadusabarot.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/91753733342.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/55061126052.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/bemixexizitozem.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/80348122328.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/45947415449.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161322deecfe96---wutaxa.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/88067702161.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/96125550678.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/kojasubeveziwupinepi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/775eu3smdh452d8esmajbdf12b/dejuv.pdfIn PDF document text
    • http://tecksco.com/upload/files/tilivulavuzefirusiva.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/72543505166.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210905002930.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/turojege.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/medidixoroj.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/bipekutaxigutitajovawe.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161467ed51ac6b---36821297409.pdfIn PDF document text
    • https://webmenuplus.com/images/file/82963249528.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/72760537964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=demon+slayer+mugen+train+full+movie+eng+dubPDF 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_off0000c6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F1 11120 bytes
SHA-256: 99c40e73bebe84a852eda42d2a49942d158102ec9f8f3990fd87e6913e43b032
font_01_sfnt_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 18796 bytes
SHA-256: a7b3476ae1ce81718825cfc42e0456f0ccccd9dfb9c0b0fdd18fb1616f1394ab
font_02_sfnt_off000111dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1