Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc82ec1ca93cf577…

MALICIOUS

PDF

91.3 KB Created: 2021-09-02 15:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12725a1154576ef6c27fe989dabb38e0 SHA-1: 6585819bc28917a82d61320cdd1846bbdedea2ff SHA-256: dc82ec1ca93cf57767c8e31e4454bd0ff880eb5b7d349499ff596c7f459a109e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to various domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The primary purpose appears to be directing users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://bidmitt.com/img/files/file/tuduf.pdf In PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/1787984518.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/gegopakuzogofedawop.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/22407180227.pdfIn PDF document text
    • http://dhf-china.com/d/files/xizoputemaj.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210724_174444.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/nenaje.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/040695bf515b49a9816809d42aede7a8/20500473798.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/23857881880.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49192145904.pdfIn PDF document text
    • https://vleek.com/uploads/files/tulin.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/89943581874.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/guxagaretolegajuv.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/81094902439.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/tewok.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c730c9ba6c---95327556674.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/gu0o8pkl3d1oippgn7pi0m5b64/buxeputanegenetegabujanat.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/8luapo0g3tenm5d0pj58358442/ripewasarataxeki.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/af5ddc63db31d2e74ca5ebd35d423648/jowisafagow.pdfIn PDF document text
    • http://co-mit.com/uploads/files/23921761539.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/17176295256.pdfIn PDF document text
    • https://alutat.com/data/file/10868691641.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/27914130762.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/31310852240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=almogavar+sin+querer+pdf+gratisPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 20592 bytes
SHA-256: b46b1ba36880bf9bbb3b5bd35b91dd9013f11e52774101fc469777511869f397
font_01_sfnt_off00012dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D6 11136 bytes
SHA-256: 427ae09555e82cce9a5d2b09a6b7cc73aedd430158b4bd326ed97c4114fdc1a0

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