Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ca82b01aa05379…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 03:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fc7a0ca7b0ea187234110e4948e64b8c SHA-1: 0a7485824a5ec987bf6a5ecd9b6be84421cb92bb SHA-256: e3ca82b01aa05379ef5ec5887674caa684d800dd820194d91e606fcb8896a1a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sasmedm.com/www/js/ckfinder/userfiles/files/paburagegofe.pdf In PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f687f7e3e9e00d0b2809021736b47b2f/86816018567.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23b223d54e---4030761198.pdfIn PDF document text
    • http://ccadl.com/files/20210903165413.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/36fcfb0cb489c3cfbc86942613076407/talexexufebovemato.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/69627534649.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607767ee31e51---rajas.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/d657799339c3c87995d7068d55f169d1/80720091659.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/tazanap.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/5bub68c9j1vvanee6khrbj5gnn/zupudirenujuneno.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beea5fcb2f7---gowipunafagewagekuge.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23e89ef78b---nogavafe.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/52897025082.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/12613218876.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094979ef3ef3---bowasufexitasifemipoleg.pdfIn PDF document text
    • http://ministerium.pt/files/22431151676.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/pejixumibebajesimowiduk.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dddde773e4d---66808932434.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5eae35ffd5---wekovejeke.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/lejajata.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/38053093112.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e51a5597fc10ad385312e2acea06491c/32526584325.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a114667cab---likukumesebi.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/papidefobupisoxaj.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/pabosasujinedimubonol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=png+den+pdf+%C3%A7evirmePDF 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_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 10512 bytes
SHA-256: b6a96ab087c4ef9922cce66e1bf9afe23541d80b93abc515a64c8da842830952
font_01_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 18416 bytes
SHA-256: 135487960699d5553eab6acc942ddba52c5da2d6a565db2ef0d8565bf86999fe
font_02_sfnt_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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