Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3dbe48b47e3b20…

MALICIOUS

PDF

94.4 KB Created: 2021-06-30 23:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0376ccc53e713ee462bab338a56f1993 SHA-1: 531f3c02ddbba8de54871d7454c2e5bfc923ea7c SHA-256: 2e3dbe48b47e3b20fc53c898b9d91d6cdac9b0cbbb8f742a6cd8c2cfbd666b27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farms on disposable or compromised hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • 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.
  • 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://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/d80a79b3fabbd5278d116703e8ec2776/90009882507.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bc199e90f---64511137152.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/43008943196.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/10a9014ec25ecf7f55d0ec1bf4a782af/sojowetonaradamifuw.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/gavekiv.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/9839841669.pdfIn PDF document text
    • https://loctra.net/userfiles/file/bovixebigozule.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6cd463e5e3df38edffe694675ed6df89/tojuzuxiwer.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/vonevoragodepasoxanok.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55612293c5---69865719658.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mal3jmfijng72hmoo1fr3re89t/16544906177.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/86412608853.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4e335e66e---12827255976.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2951227cf0---jegusepisaxowolivag.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/39k224mp6voaqr3cmv3t35isl4/xepobofoge.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/73259850567.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d91989bcd712824838bade72d38a7c86/13866135523.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d4ed7550c08e0bbb88774cf9d7a46e6d/fepogopatude.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/wawexubizegebuzesixudipa.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/874dc4878fcfec577bfaf375361de1df/84847043145.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/fenapowoz.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/fifel.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4320cadfc---69577848041.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16098bdf29b3b8---sipenag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=geography+of+boholPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 17460 bytes
SHA-256: 6db8f6b8bf24f3be8da751eeeb8a8a857a277fb318cc6a4e76081371424a86e6
font_02_sfnt_off0001277a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277A 17280 bytes
SHA-256: 51b564ebbf2922dc7632cccc9da0f66233b69c95b0e2efe8280b1cd6685d9d6e
font_03_sfnt_off00015467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15467 10468 bytes
SHA-256: 42f7eb6ed929571f576e6f550cfbe96ff2611ad4c2aa3df48bd61f077f2f348d

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