Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97b759226d41cc7…

MALICIOUS

PDF

72.5 KB Created: 2021-09-07 10:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29e84b236be87f492ddf762a0549a1fc SHA-1: be410158a8b5d1e27cc382bb836a7e68a9d2b2f7 SHA-256: c97b759226d41cc7b6eb33a718e22c277934ee7d641562d2c7e1549b4e0ba7f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a large number of external links, many of which point to compromised or disposable hosting. The ML classifier also strongly indicated maliciousness. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to a phishing site or download further malware.

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 http://czdashan.cn/uploadfile/file/2021051612455573499.pdf In PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/86070845461.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730b3c000b3---dasiva.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3950ccf8d1c463f607ae981e07387671/wijepasej.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/22849840523.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/gubalurujugorijovojajidi.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607280535204c---jegunalivugenoxidumupo.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/telanudowezun.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c462b27c281---bilelotofazevisuf.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e391718a275b3f637b0297a3f65ae9e3/vivudevobo.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/fekaxuf.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/wawozagewuborino.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/nizozu.pdfIn PDF document text
    • http://leton.pl/userfiles/file/46703032087.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/59a7db97033deb79617e68e4c850f867/43065216798.pdfIn PDF document text
    • http://midel.me/userfiles/file/59752073143.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/xodudezazokasiki.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/da2e761fea80d258913ca48d2e42cbf0/xakabagamoxolekegux.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/tefafufanusovo.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/cedfb4b5088e03bbb21a03d5d7b227ca/pugemuruburabemulobaninut.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/70540170704.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/21489114580.pdfIn PDF document text
    • http://chinazzjx.com/d/files/xamabuwupigipuniriri.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/pimojozazefotomi.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/fa256d54df6e1561e95eb8f6361d6dae/fidumafemid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=jagung+manis+pdfPDF 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_off0000bbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBD 16100 bytes
SHA-256: 3e391dd25eedec4bfc86eb4d8c0ae8bba00dbb1f13c201471f7c293c1f487e88
font_01_sfnt_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 10436 bytes
SHA-256: 04870034fa470e43acf5328e1317be3a3289a936ef57673c63400b345d94fa81

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