Malicious PDF — malware analysis report

Static analysis result for SHA-256 59060aa031c2887a…

MALICIOUS

PDF

90.5 KB Created: 2021-06-30 02:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc6bcc3639f2ecd0a7a9804e95b7ebc0 SHA-1: 900d0a8a2e7fbd0d537f3087b2b5f9a6bef2dc41 SHA-256: 59060aa031c2887a900a3d1b5643f92a655bbe79ab153e645e3a429c5d99cb24
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both flagged this PDF as malicious, specifically as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to lead users to malicious content or phishing pages. The presence of multiple external URIs and a link farm heuristic strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://prtl.pl/userfiles/file/kurexamodogazozupu.pdf In PDF document text
    • https://abugfreemind.com/userfiles/file/dewopemoboneb.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/telezuriwoxo.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8hlk3chgk3dl6ia0qcke1np8tb/1843484875.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed9966f4b6---musigabiloraxenijoku.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/lanijifejazowidas.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/69302ba06a4e3082e5f137a0c2795837/5647577029.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160866fc61deab---rariwokejiw.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/7q0nnhkc7fct7g6a0kro98n3fr/seralobazu.pdfIn PDF document text
    • http://cmtsport.com/pliki/4583813589.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/vuxomav.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/dumexatupekidaw.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b914a34f452---97755043280.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9dc68bbc07483d5b507cbf228091fd51/zagigewexarakotumugok.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7a77cfd1ce844a93db41ff642e7bb317/89181478985.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/82239665017.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3e41c456185c2f79583693a6bad88ddf/86978556853.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/e5221fa430623bc8806ab2977f998c06/volewuguk.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba4e7c8130---mijamikavogafigafunutuli.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/rowifiropopavajap.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b19e51bd62---talefusot.pdfIn PDF document text
    • http://apsons.eu/files/file/27766187339.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86181bb21---21807766538.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/20a82835b21b24f32443b0017c05d325/dariziresaripa.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c34c787cb---55039573069.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/butixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=html+to+apk+android+studioPDF 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_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 17404 bytes
SHA-256: 2ce7b41169f21537dd49751cbbd0d574f5d2b60c9ded9e0e81486527a9422e2f
font_01_sfnt_off00012c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5E 10604 bytes
SHA-256: fdf9370baf44a0e1e64ae47ce1c0ceaf6bb85b1242d4858b03a25d30fdfb9cbc
font_02_sfnt_off0001447e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1