Malicious PDF — malware analysis report

Static analysis result for SHA-256 17523f15b283c6dc…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 08:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c7d3813a11a55a1ff7204767b1b9210 SHA-1: 90c8c7fb77e0a87a42236f627e8165d0b1f08ac3 SHA-256: 17523f15b283c6dcdb1cc574f8d2c8e458b3e331b3a7c9c78277520567269bf0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/420940ca1163b24a79f002647a533e9c/21053943325.pdf In PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/38751041562.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef77338e4e---50721110479.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d172f2e3---zapuxuwapiposulakenib.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160730b2a2c214---81922220052.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/salanur.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/76859024639.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/sugatodusiduru.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/nijibopela.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/teneloke.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/balezawezij.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rewasupedulexewekap.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/rujj3ipub2ce2ppfpvgksl9b7e/lezakunonu.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/j9i9us0iot41bk8grbcjuf6vh7/4325097910.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b2d70e69cfce6a4428bc78517db08e55/65281353814.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/84446117485.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/444bf94daceed6fd84f2247521755ed5/mowosopax.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/dkbrtdejn00ur3139tcfsu29av/87799545547.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8d3f7483404eaee32cf67a833ef720e7/poweruwo.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/zaguveneziludapexin.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/riwozujulot.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/45375070346.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ad0860e75---zetakuketatudatun.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/ledugufufakonizuded.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=multiplying+scientific+notation+worksheet+8th+gradePDF 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_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 17220 bytes
SHA-256: 6db9005cf4148686aab8312f7e1b98d2c644124a0fd18b25d51cd1c5e5fbedb3
font_02_sfnt_off00011ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE1 11492 bytes
SHA-256: c50db75f52413a1a593a4b5694c9e7a3a97838345e482ed3694cd17482872da6

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