Malicious PDF — malware analysis report

Static analysis result for SHA-256 5220327b8a1830bc…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 22:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5cd2d376d0a45cd0bf1a89e0031a5c97 SHA-1: a7a7164f05faf857306e0de6f6924c77bf8ebfee SHA-256: 5220327b8a1830bc429b825df93c4c7a927e50bf15aa5aefb28c1d0f5d2abdd4
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, including those leveraging WordPress upload vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are often used for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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.
  • 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://garglob.ru/uplcv?utm_term=principal+of+agronomy+book+pdf PDF link annotation
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125a2c0ae052---fawikosaxi.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/6985316111.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/13104835350.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/31516130113.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/ravarivufof.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/fubevisoruxutevobo.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/b1906c362080ef93200667b2020762d0/19964015703.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee4aaa776---51515547185.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/78436816842.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/95780607524.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210505142400_647669123.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077d9f6a34bd---maxivabuvit.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/19849770622.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/96591010768.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/tuxowimelejefe.pdfIn PDF document text
    • https://morabia.fi/images/file/rozeselisugenede.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/42806806700.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/n2op60v57b48t1vj0kgqnq5mvq/lifunotajabolikazupi.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/sazagefiratupop.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/fimutale.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3766789ceb---fawobibetixibokezowodazod.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a2ca8d2e8---66270949917.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/30345809578.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/31961262360.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/rimufoxetadipigozi.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088f34e7166e---81854507425.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20cdb55ec6---pixaguzidutazowug.pdfIn PDF document text
    • 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_off0000c5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EA 10912 bytes
SHA-256: e6ef57b2a76f6eba9f38b41119364699dd1b27022d02d1a2ab7eec239b3f269f
font_01_sfnt_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 17528 bytes
SHA-256: 8786244689ef589887cff8ceb6bc027cf437f7f59f4dae3fd80dcab11125a4f2

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