Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c390274386fc0f3…

MALICIOUS

PDF

93.5 KB Created: 2021-07-05 17:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9527508078e9b019f2a04d60c0f50200 SHA-1: 6b63528a0e9e2babfd7d69dda9822bfd8963e0af SHA-256: 2c390274386fc0f358f8a338227f059f5d1737feb366f730ff690a183c23fa84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=be+turned+off PDF link annotation
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/fc545e7551e07ef8748471060912ccd9/75558976201.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd5b66edd---vebamikokazanakenenar.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/46007337266.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/44c426ee95085acd41721668f0c690e6/verix.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3445b2da---19695268893.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609258dcbee35---felime.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///depukunubef.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b476fe85---dulajitizufijewebatebo.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/71319482442.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c0a8sfmb5hbeub9spr6m448s1c/ligakagifibo.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/88744574218.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/4d8b89b0e8dad34f7f7a3288507fb8ee/71619019989.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/04a5bedf3042eab5bc8cb63dac8ccf1e/xadakosasedajiwunif.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/04hjcuj5f4325363atab88f4k4/43107615547.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/dfkpvgtjqmudd87p3pc23kdpm8/21845525402.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/gavofogivupakejerazavev.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/1968333483.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f8ba288954e21522e8c223625ec9eb78/rakerazu.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/37036983604.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16084e2fa8c6c6---23034649297.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/kapurudu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f0654b50cee545b9cd7fed4a60723889/dafinutatiraremowajurixo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gulasixebazusi.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_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001234f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234F 18072 bytes
SHA-256: e0ebba197f433e30050c054f2c90a439c240f0ee486c5d86b7d275b9281e6057
font_02_sfnt_off000152b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B3 10032 bytes
SHA-256: 2db2615ec678eb89f4d1ade0168a211dae024b8233e7e7bb6b914f7ba1be1d9e

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