Malicious PDF — malware analysis report

Static analysis result for SHA-256 a465fe194c84c2bc…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 09:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8403c703cae410a63cf2c1998dcb6cbc SHA-1: 732755b2a1282ff986efca7a73b9c8200aed301e SHA-256: a465fe194c84c2bc77e4dbc78f1e71735eb230f1b133d0812f72838a17163dad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. The document contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a potential SEO poisoning or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08751ffa2---88874239501.pdf In PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/batowunoxe.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/35001090246.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210717014756.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/21894846691.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/ad9da96021d2f35b1ed4d3492298d82f/12151191636.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f7479f41---33635594994.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/vagasojifel.pdfIn PDF document text
    • http://cycling-software.com/files/file/4692578330.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/83c2112dc908112c567d02b8f813e1d7/96254525646.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/10925327808.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/6ab22d3634c61a74c2a026de06cb5648/vedipemebenojeperulojiwo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d33b53fed---berofejuseguganodinewer.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/79424301223.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1khru86uglp78qe8aa0o95e4n6/siwepunupoj.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/tudivebegukagasifekifet.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/30455346228.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/7d2o17uflv8sdps5g5pjtht4a7/rumasaxaj.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/tumodagevalolimowirapow.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0abf17b22e---baletamazemajatidoleko.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/tt08id91ekugq1p12t75ph4ll5/5484566040.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/74214288980.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/51417599309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pupuk+kcl+adalah+pdfPDF 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_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 10096 bytes
SHA-256: 1c3c87915a22d1ab1aa16154160f7a6713b9acf72f4ee23a3d2353cdd22a5b85
font_01_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 17232 bytes
SHA-256: 429cae0cb704d099326bebfcbaa8e598ce7e5c54ff2b81f2481d2569bf10c6a8