Malicious PDF — malware analysis report

Static analysis result for SHA-256 add82498a7585ec0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 00:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2bf5f35021027e3daf182d9f0cc1f41c SHA-1: 7c64fc513842d9b074967cae3ea690c2fc6cf043 SHA-256: add82498a7585ec004eac56d3ed4f74fa3980340c27925197eafbc563699bea5
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous links are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://jujucuisine.com/userfiles/file/wewanifoxidun.pdf In PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/75f94112a02e951447914cd0d82aecb2/fawirivufib.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/99748201074.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/divevuron.pdfIn PDF document text
    • http://mousike.it/img_ins/files/rulamu.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/64606766524.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/18033483128.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/bamopazik.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/202522b9d24e7c8cd851cb79344ddc9a/78054048571.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/lulijuliwe.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daa338453f---zinoridafebajo.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/78336389514.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/mawakevukafagejaxidalegax.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141beacf2cd3---79571221559.pdfIn PDF document text
    • http://a899.net/userfiles/file/8829014660.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/53304510824.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec2d242422---44106168938.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/12297627674.pdfIn PDF document text
    • https://micsys.in/userfiles/file/dugin.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/rawasudelufalirunovuxena.pdfIn PDF document text
    • http://guchen.ru/d/files/tusulefimusudimeto.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/50032454560.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/sepomiwevusizijijufenos.pdfIn PDF document text
    • http://erictex.com/ufiles/files/89000881197.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7db137d6edb90e91455e959e8f92a8b3/54259079731.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/84581586315.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/5440994330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+see+who+is+searching+you+on+instagramPDF 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_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 10924 bytes
SHA-256: 9af5736a1673856e9805c0e845d7cb3f21342fb2e2a48eb4f3f63ccf0ae56fd0
font_01_sfnt_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 18288 bytes
SHA-256: 9fc953d4a95e5fe7577026d2e08222375a22f673a689e33b7509683005d328e6
font_02_sfnt_off00012566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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