Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bd1068faf0b777…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 05:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a684d4e5ec8f42ae2d5f261701ac116c SHA-1: 7a4c45357758d1b0775c3b6d8b853e7b8f271a79 SHA-256: 58bd1068faf0b7779719eda5a9de783e7c1aaae32789d239eeee1b28f9e7b572
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript further supports the possibility of exploiting PDF vulnerabilities or delivering secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/jrslmvhcb8likdjdsas34m65b8/18131386186.pdf In PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/vaninifobawugiwemoxom.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/11152447529.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16083bdb841ef2---44271371869.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/xiruwoxororejogige.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/dik9r66kac6064lq890puqhin3/pulijoseleki.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/kopuzebutizan.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/91411035860ff8d90729cb.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/97319629e0b2bfb9bad9bef5a4bfb86f/64379717110.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/t2v787gaum3slgmif28cp3dhcs/pedesixotimamobofogo.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5e43180d9---lawidofawevaxasupazadisu.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/ravenugixugab.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/99729523456.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7f619700caa2ae3fa5a741e0d1eb7fe6/6238572035.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/83206296004.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/nafeb.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/wawisad.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/duxoteravalexotij.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/neratigixepopewifotula.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/848f9gfua00dsrpij4qctvpt71/7354021247.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b58405dd06---vemugewepedenakuvopumen.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/87689155111.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098cc68e747b---ximofipilopebevalog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gum+tragacanth+functionsPDF 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_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 17616 bytes
SHA-256: 54ea5574907be396bed2caac04a50df385e7719cad7dd9f9b7814535fe000cf1
font_01_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 10744 bytes
SHA-256: aaddbcac0635f32af4ce3ca23b115605e4ac789c45c52bc4a0835e783c607695
font_02_sfnt_off00012b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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