Malicious PDF — malware analysis report

Static analysis result for SHA-256 62cc6634ea750f5e…

MALICIOUS

PDF

85.9 KB Created: 2021-09-23 11:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13f3e903477a8f386547884dd38be862 SHA-1: 6e7b40cc0fdc41819b87d5b695a1ecbcd228478b SHA-256: 62cc6634ea750f5edabef7b314dbf90766618ad8e56f0352bce6b2df1df9f4cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of JavaScript suggests an attempt to execute code or redirect the user, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ww150002.linebot.net/upfile/files/20210923101501.pdf In PDF document text
    • http://theloanwala.com/userfiles/file/42076649182.pdfIn PDF document text
    • http://robbes.nl/media/files/13901636212.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/sumusadalivegop.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/vikidavajironamido.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/7939138309.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/1849282984.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1632070911.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/62254219235.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a70fcdc1eab025c486ae88216e533739/jawawo.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1f2a7f1a841509e80a86ac6e32386477/bipofoxuxalexevawo.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/sunuxenedifunukogeluveza.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/remirulapibevetuzudorero.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/zopuwumujuf.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/2448448073.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/15479316596.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c28c8bee030ea0c4ba3238cfe962d343/56719698457.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c1a4253b41082e3cadfcd6f66d0e3546/vipomovavumuxosanipujasu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/792f5a3e2ccaf93d62eab5050d1ceda0/wiwuvazajafalalorisivef.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/xateku.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/tugibofomiwefixumarowaki.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/radaxawow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=super+machino+go+apkPDF 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_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 18988 bytes
SHA-256: d67390db00bf3c4c54616c73c3dc24749cbb3a9347f88500634a82ce72d39880
font_02_sfnt_off0001318c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318C 10776 bytes
SHA-256: 0671b6537e5b73ce44260958a7156c71574e46892df6ac1b5b980e960bd3e3c9