Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f00e21d55e071f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 10:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e86beaae560994c9fb059c08dc8db97 SHA-1: 5673274b6f7cda201b7f0477dc0cbd9fd868a88e SHA-256: 22f00e21d55e071f12a6e30383e6e4068d9e7d317d3e93350f4e81578cca6480
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=best+free+music+download+app+for+iphone+offline PDF link annotation
    • https://rimsball.com/ckfinder/userfiles/files/85496522733.pdfIn PDF document text
    • https://12shio1.com/contents/files/43116908864.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/73224630815.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/17744059899.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/ruvatotajikudutadatavefu.pdfIn PDF document text
    • http://186086.com/upload/files/34369246462.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/vimedonedimurotuwenapu.pdfIn PDF document text
    • https://orangerun.re/photo/files/jujot.pdfIn PDF document text
    • http://vaynhe.com/upload/files/45132742691.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/43171117813.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/betawuzesexoze.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614258d474f65---79486527434.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/29438282585.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/98743201487.pdfIn PDF document text
    • https://t2sc.me/userfiles/28121915285.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/j8khknj7aqbpp4bqe3ei72s25a/gavobozejubeze.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/61548156165.pdfIn PDF document text
    • http://nenorm.com/files/files/sazek.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/9evu9lqaphokoivsrdi4g1nuk4/nuwozunejojubaxufifege.pdfIn PDF document text
    • https://csodamalom.hu/files/files/someroteretor.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/db23fa6d10bd32800503885c28db2f13/18834200359.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/78650955227.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/nevovivatepa.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/kominuzesikubakele.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/fovagukenedajotadew.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_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 11124 bytes
SHA-256: 49564d41bef8e0ea2180cc201180fa5f2159d8369b997f7185fe5c3576aa027f
font_01_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 17256 bytes
SHA-256: b0a7cadf5e5babfc75552d68e7b4773062490f426c331dc61bb6f7ec98a7c497

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