Malicious PDF — malware analysis report

Static analysis result for SHA-256 58151c04533c394e…

MALICIOUS

PDF

94.8 KB Created: 2021-07-02 00:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bd35a7496233fda1135fa0f94afd936c SHA-1: d0584415b631485bebd4f07615589afd58af18c7 SHA-256: 58151c04533c394ee01191d1f20e62ba67b42ef947473a56ee253bd5ded1ed65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://cristalparkhotel.com/ckfinder/userfiles/files/39943807782.pdf In PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/8mu6fm9tgtrfl0km5opbk95j53/nelitafilelo.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec2e0d6106---sujesitulasivakepu.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/zimuki.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/4107020699.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/pudizize.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c3bba3502dd66d54f628ad256cfb4091/nazore.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c2ceeb10f8ba41ad841abcb7de53f496/paxub.pdfIn PDF document text
    • http://suttonoakfarms.com/clients/880813/File/daramanamaxam.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9107d651caf4e2be73c52f0d0fd3806f/gadulazerusubumolexow.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a94dc4dad7b---20056938160.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/wepowugi.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/rutaboloxodalejajeparum.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8aae22be5fd9595e162f8b66d582c9f9/25422729842.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/nepijivofudijonopam.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/b7bd553510d759b7a4dc5ee7a76969b1/dufumezabubojiraku.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608444cf3bb89---ruxuruxipifetolekakeb.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87146db61d---fexowavek.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eedc9634c3---zanamesunezuzisal.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70ae459e4---vekaxoxoxajarixipigegebo.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/70087108423.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/viximetelagutijefara.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/vores.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+craft+a+cauldron+in+minecraftPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/39411211109.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_off00010c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AF 10644 bytes
SHA-256: 865e3d686ee5d49bbd78c2b3bf98c4f197b6330b534c01ff818b5ccdc273a2dd
font_02_sfnt_off00013d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D06 18508 bytes
SHA-256: 706d839f8ad0aff02ae0ef5fd5ce503a69961c81284eee5f7a08fd7140a160e2