Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98f9d96ad543acd…

MALICIOUS

PDF

91.7 KB Created: 2021-08-15 03:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 292635b4a4a0ed97534c2b391fcabcdd SHA-1: 31fb284aedf5a416cd33017b2403fd0174f8c214 SHA-256: d98f9d96ad543acd9c6885a38ba8f66400513c6888e76457f4da8fb170c983f2
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many pointing to potentially compromised websites or disposable hosting. These links likely serve as a link farm to lure victims into downloading further malicious content, as indicated by the ClamAV detection and ML classifier flagging it as malicious. The embedded JavaScript's specific function is not fully discernible due to obfuscation, but it is likely involved in the redirection or payload delivery process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cr5dsrjc9tu816lkch1dgi1fv1/jimurijifazepokipiwutaz.pdf In PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/79022875984.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog//file/87489196313.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/69860885776.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ntune2m7fcvv7ra99gemi5qh32/44081801327.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/42392223861.pdfPDF link annotation
    • http://grandrosso.com/js/upload/files/38858665933.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/dbd04a8e97a9165ff56bc46e19a123b9/53651256659.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/gesopofudiwina.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/344d1f633317f31d9801ed920c8bb2a3/25927777776.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/wesog.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/lixij.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/1044856932.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/mujivudimedunefavofotupib.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/galozemilesedevusikape.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/vogakeled.pdfIn PDF document text
    • http://kag.fr/userfiles/file/37061995138.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed5d78ed15---somipagetena.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/37345332817.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210726/file/16272886196498.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/31204e87fd72396fb8e1e6aa38058956/44431270463.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fe117f59d977a6264f6e0da0ad1991b6/pojexevikiviba.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/kuligipizimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+draw+tab+in+wordPDF 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_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 17312 bytes
SHA-256: 01c0074d38121646801f721d9a302e30756566f96014c891945925c71e88c71d
font_01_sfnt_off00011acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACF 10428 bytes
SHA-256: b464ea5803d6c587da5d32581d0db469995d4cb772291a6c550331981ad12678
font_02_sfnt_off0001325b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6C 16236 bytes
SHA-256: 9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40

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