Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2db5ef6bdafb47…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 21:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 092281e81c18264514e5ce4f9d0e2eab SHA-1: 37fade4ed240d4cda6836e3932341c713562de60 SHA-256: 9a2db5ef6bdafb476926c432e16929247493478c1318b09e748e4b618def0a18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further supports its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=extraction+of+copper+notes+pdf PDF link annotation
    • http://portamarioarchitetto.eu/userfiles/files/24350786046.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/cnb49aplb5v9g15cvjcarcnq9m/kubagutofomaragolove.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/g991pup3r95k5o9ci5s6vch367/64052052594.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/38640035074.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/52131801889.pdfIn PDF document text
    • http://knipia.com/userfiles/file/68577206914.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/mazutebaxinobezarik.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/78392015491.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/16469918787.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70979369116.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/14mf189tbbb5368bqfl4665up4/xukevijixexonog.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098510b7458b---vuliwosuvumuxodije.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/purinedep.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///37250542633.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/tudesavazokov.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/duvevisizerilufef.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123b753be7f0---ruroxupojidotutexaxu.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/pasubezofajonopanuxax.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/zatarexariwezufabex.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1dkqb7ak7co64mkusq3en5r3t0/jadutexovax.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/fosovukidek.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/38815777646.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/et6eiima26bqg6bqtvlc1h9p6i/sewunijuwavajatirebugafoj.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_off0000dd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 10652 bytes
SHA-256: e35b48754adf3996693fc1dfdc28d4f83959b86b82d9fa28d5e84e1f7e8c99d2
font_02_sfnt_off00010e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E34 18224 bytes
SHA-256: 7c146520e0bc57e8e3a55f00370230d4f86cea8b0b59d694726c47b2867aa034

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