Malicious PDF — malware analysis report

Static analysis result for SHA-256 425528526b2d3f75…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 21:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9873c27d933cd039596bba3a125ed420 SHA-1: 5123d1af32314dd291f9125c1b3512bfc3a3efa2 SHA-256: 425528526b2d3f7568a494497106fb79616e91281bee4a111db54bd7460b2019
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to redirect the user to one of the external URLs, such as 'https://crysiq.ru/uplcv?utm_term=free+roblox+gift+card+code+generator+no+human+verification', which is designed to exploit user interest in free offers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=free+roblox+gift+card+code+generator+no+human+verification PDF link annotation
    • http://www.bash.cl/media/file/ketuxudipiverakopakog.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/lopuvelosolovabefumawodug.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/36597910256.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/nozuwufikabixowobilaj.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/66169662114.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/90847735552.pdfIn PDF document text
    • https://mar3ol.com/Files/files/motivopozekepivopinuj.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/34782546028.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/vimug.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/18517150803.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/zeniru.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a5a65595e---75725460426.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/bepakusawexefixubokab.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d44709f4---xazeno.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/64947169229.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/vokabugugekadoraviwitix.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/22488137391.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/10398490864.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/59868434948.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f55c628b0---88125973412.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/pizatekedizezefarerezu.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/76367559405.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/57663275437.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/55501653494.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_off0000c3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DD 11140 bytes
SHA-256: 937952cd16254bdd5c3fe4f471b53edcd53c30a6cce8299548d33e52e6152157
font_01_sfnt_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 17284 bytes
SHA-256: fdda162acffca9abd08ea8517ab1642af66933b71730c592d4d130f2f8ba30ec

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