Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6de3df14bd3257…

MALICIOUS

PDF

73.2 KB Created: 2021-09-05 01:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a18e0f21d475a83ab63b1511a619302 SHA-1: a6cc7cd9e67dcd335a86cf63ccb6871632a177d3 SHA-256: da6de3df14bd325781275b8f695bd6f45910feb5f2402e2732bc760e5cc1d90a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The document body is unreadable, suggesting it's not intended for direct user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://chinalabware.es/d/files/rufiwipijutozamegikujoka.pdf In PDF document text
    • http://www.kickcommerce.com/userfiles/file/3688997758.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/27656546963.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b46fede4f9b---51272178533.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/7123859270.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/mewezarirojivurefolowuvi.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20218298198679.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/ferirusurasa.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b8490022---daxadikeweroz.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/litugerofusiwi.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/bigajusazitadu.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/muboxifewuvolewitaniw.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01ebd2fe74---72762019465.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/i1pue414u7b3c48ta5n7iqu0g5/bakikusudip.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/jubonajivugutefoxi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/g753pvlq6qgn0b5ahaiaglm6l6/63719276872.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/jilivenidofeje.pdfIn PDF document text
    • https://mackbeks.com/files/file/fadazotewivoxakabomoximur.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16079860b9625e---pivonizelivevi.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/xidatiserad.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a100f45037---daxoxisiwesurasamafusa.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/muledirevijosi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/591061b57f61fedfe2bf0a1ae8b38268/gajikipadow.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb435f1904---30165770839.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/94750716827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=satyanarayan+vrat+katha+telugu+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_off0000b993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 10844 bytes
SHA-256: c8aae986a1f674587eb28f4665a3f48331544207cd48c12abdad51fd0e057ee3
font_02_sfnt_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 17384 bytes
SHA-256: 8cbec6531af2ba2a61f1d709c5c3c51cbe15af35c6fcbd87c61a3ecb26679192

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