Malicious PDF — malware analysis report

Static analysis result for SHA-256 c740ad2648d4bf2a…

MALICIOUS

PDF

100.3 KB Created: 2021-08-25 08:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a44a3bf8a74d2404da0b13c93ae01c06 SHA-1: 7faf656a9044bde9a5942985b264776a09906cc9 SHA-256: c740ad2648d4bf2a80c2990f74b8c5ff77ff6da0c6f34473a5448a92136c7fe2
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://fantalife.nl/userfiles/file/64480357006.pdf In PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9311b4dd9---88536618846.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/9365427921.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/97865926771.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/95b5188c7b834c21c8eb9b7cf4050da8/resosevegebotodosedivu.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/327a16da4b0e4f9ebf8348dffaf27c3c/woxogekorobat.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4fa6e5461---49731479981.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/18142434989.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/jikabonesuvozerapo.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dee373ef27c---vorufegubuxivesibapelas.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe0627de722---jexomajivinolanuremefe.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/fc4a2b45b132523b9f727c4ef71fd069/20190106335.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a02333590---rulekel.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/51562aa1b734c6a2ecc865f96d9ddec2/8680870751.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/wibiwoxurid.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4cf0b605a---72480395145.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c8c3d41e8---18658710039.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/lineraguranepop.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/68067001761.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b14de3667---ruwogevexutezofomiji.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f81605fbf---tumewobokogutonogixufi.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6fc05ff625b0f399e4fa35262872094f/sorivabixi.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/lupoboresafuto.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/42878695469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=flow+over+weirs+experiment+reportPDF 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_off00011adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 22360 bytes
SHA-256: 436eca51908b7c98a8ec757785f8ee988697c3713f27e53853103a6a85aa83df
font_01_sfnt_off0001534c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1534C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B63 10484 bytes
SHA-256: 3e77a4ab17aeab8361a008ee15787ab7775d56f1a5b23b4cda3bd625897c398a

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