Malicious PDF — malware analysis report

Static analysis result for SHA-256 496c3c632f1d0868…

MALICIOUS

PDF

92.7 KB Created: 2021-07-01 15:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3dff4b51e589c3299a3ffdaffa5ba58e SHA-1: 2ff14b90bfd906675c5c40729b8833f4edd93372 SHA-256: 496c3c632f1d0868ab918333298cd4490e9e170495b9c2af1db0a275938f5d54
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of link farms and compromised CMS uploads points to an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a1f3596a---98854442300.pdf In PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3c81d5fd0---tikadof.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/bajapukab.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/28110570896.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/pt64i763qtiteq8pt0cauvs784/pefarobosan.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/0fa8cdf2e17a1aac1506159393126bf6/20877264475.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/837cb2ba605a8c41df3256b9490d52a4/gitumopuvi.pdfIn PDF document text
    • https://digireg.se/upload/giwar.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/wukirisuken.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a5ba92b87---vofiduvuxuleludadasen.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c4b0dbf22---55221851477.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/54919513131.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210607_68A45DC722A574F6.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/43360f0838c3fceb1d9ce2d29cdfd7a6/sumaponirilivir.pdfIn PDF document text
    • https://argumentua.com/i/file/pulazarodikipagivimu.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/bogizibubumumamafax.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/86441212557.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077464a869e8---paxitarigov.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804de0529a2---rodalujog.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/0ee41e487ccd1ece99b469796bb35d33/nebuvewajarezodizesunif.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/4640875482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+soothe+a+belly+achePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 10364 bytes
SHA-256: b21dda80a2d68ba470b4b758511c70cdeb99c775a619c617d7f178a4e21e9063
font_01_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 17420 bytes
SHA-256: 79995bd9984b9ab6d03d72ebc1eec7275890249f4ab3c8ba1a21ae00dc90e4e6
font_02_sfnt_off00012180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12180 16808 bytes
SHA-256: 9b7bc2a898c4a8cc4bae3bc7f450d43ec9446a45ad1603e0c340ab8615b25ea8
font_03_sfnt_off00014d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.