Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3230f1bfe232f33…

MALICIOUS

PDF

170.2 KB Created: 2021-06-27 04:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: aebb5a8400b4c29671ed2994a567a2f3 SHA-1: 69fd6aa3d441b8b8d48073708d2bc3222de890d0 SHA-256: a3230f1bfe232f337627aa4d8762c1bd8f94a09014d6d6e063b99bfde139261f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of links pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://garglob.ru/uplcv?utm_term=thou+shalt+not+fornicate PDF link annotation
    • https://himalayanthailand.com/image/upload/File/66048474913.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b167fce106---95440889822.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c2591ac9a9317e379fd5ef24ef331cca/42832714383.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160831979dd8c9---23940321857.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/jokemovajar.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/78e3f6558d32c086b86915f51ddf392e/19648894519.pdfIn PDF document text
    • https://rcot.org/userfiles/file/guvirijekoraralakafuji.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4dbe057e838960aa1b4b06c981235077/nafojodazazixok.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/ruritu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96d69e591---64716503964.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d615e577b4a---47973349824.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cf6ad798a---29059196762.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/36cal1susj1u8shfsuu6ju8fjm/momesemitovesutififobokiw.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/43848375386.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e30175ad4---nimowafavafupugulopin.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf62dab077---vabejuzozunenago.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/lilosatekixiz.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/bc1c9eb980c8898c4e0e18f298431200/modokasofer.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/wegezumusakagenu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609849c9276f3---83359069390.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d34a91ac3a6---xuxibizizajukupato.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/7793081491.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/7ab4cd6cf83c63f67dc8ff03d92f213a/lirir.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078b730cfc95---230492273.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d0644f6f33f5fc4952955e62d6d39102/92556279568.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_off00023d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D2B 17068 bytes
SHA-256: d4a86bfe1e7ddf54e8577fc9bd23562e68770aaf80217f9bc0ec557f84e3e067
font_01_sfnt_off00026960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26960 10496 bytes
SHA-256: 642f7cba279e91b35b550cca342565257928a5a07d8e5ffc56000c44559ee564
font_02_sfnt_off0002813d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2813D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1