Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea9578cbc3d5aa9…

MALICIOUS

PDF

87.9 KB Created: 2021-07-22 12:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ec07637fffbf5a5831ef7eebeba04ef SHA-1: fbc21d13445e47aebea39d0a3b88a75c21fe516e SHA-256: fea9578cbc3d5aa9c98ae4b3d0b7285f72a3aa8f583f2fa97e7afa8b7b7be82b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • 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 https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1e3aa737f0f33f4d749d6ae4fe134cb6/90918285204.pdf In PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/madefojonalal.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/71946977337.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/fosivinakebizes.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/80164779613.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/biraxuretozax.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/82867557271.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/94825540815.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/946941489d0699a763ac56346cc54fc0/xuvasikiwanataf.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160760d1eae928---25135268167.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df710dbccb9---73826728889.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f263ac014---netaxisagibewinasip.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/65067330273.pdfIn PDF document text
    • https://airshow-bg.com/file/nunatoxuvatosi.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/jenazu.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962f5e09332---wodilulununokoxuzigug.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160806c2d89a12---kuzufuxerewib.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dazibepakavodaxog.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/wenaguzewikirigisigevida.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/nafabemubal.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/dusololawoperilusujireba.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/sisujojakutobewiregigo.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc9f74dc56---nozalon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bpm+to+ms+conversionPDF 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_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 10448 bytes
SHA-256: c3b1e53848e890cbdf3fac6919c04095e966ad7fb4c62a5657e56197de5b9594
font_02_sfnt_off00012274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12274 17744 bytes
SHA-256: 615dd74d7b839f1e08ffadf000a279e868bdb42377e821e933f08b120f415d92