Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc520e98a88eb1b5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 10:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d7fdaf102b5d97a0a4763ece4927e6f SHA-1: 5b6143fd70f48c5aeccd3538e42c3688f365d9d1 SHA-256: bc520e98a88eb1b52668e5ffaf7d3738284fb3472d95ea0aba24512a8a558a27
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://rizecanreklam.com/images/file/rivuzaxotupiluposetexa.pdf In PDF document text
    • http://iberia-ex.com/images/blog/file/2039392036.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/basakizefemogez.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131fce52cbba---kudezevusubafonasimixozis.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/44268345207.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/nadodelasufujagerusikulex.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/87259445665.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365fea79a05---jolumupozorapuwebitenuwax.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/2547864854.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/magugajapoj.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f926495a56---jutuwozu.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/7899648152.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/39077294130.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/bibemevexotume.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/40218349398.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1a23d0b10cb0820fa94e7e450f913492/duxelupara.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/31071948598.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/tujalevixobugizabiti.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109011446365894.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c7df1fa9d47edae73c1adb2915a63ea/71900336854.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/20168289286.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210906_160343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+brand+new+testament+watch+online+free+englishPDF 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_off0000dbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC8 18976 bytes
SHA-256: 925f305307ca3980f69db823ab632ea4ae8e8c1097151e6fc213e63087cc83fb
font_01_sfnt_off00010cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 11112 bytes
SHA-256: e17989d322329a8702e28f7734ef083f1aca87cb796eb5f8d9d28aa1f0c790de
font_02_sfnt_off0001268f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1