Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0d39c89e7bdd41…

MALICIOUS

PDF

88.9 KB Created: 2021-06-26 00:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a3117349da92ef4f872bdd76350dd127 SHA-1: 4ca84c286c6699985628cfb0ac10390c80264708 SHA-256: 4e0d39c89e7bdd4131f46822b400404e540f2e572a61f99b90c76f0e543725fd
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 sites, indicating an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms points towards an attack pattern focused on directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/cde9d795d08e420389564012d97a1ea2/50176650214.pdf In PDF document text
    • http://murasakijr.com/uploads/files/sipumedogax.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/v6b8nkaeoct7ppthq807c1jsjj/fulakireferizufulex.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b8b08da96---koseverafomuzabetorivu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b0adef1e9082f3b94b2494cfcd0a9548/11910507570.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/439d454b9b40a87222264b415fae0bf9/gufalafuwaxupogi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa79762fe9---13087240117.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/77ae8f55ba51cc7bcf02333f4a0ac068/59805002847.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/74840277971.pdfIn PDF document text
    • https://andrejc.si/files/file/42386638821.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160968020de825---pajigubugavanebakuwada.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/fipel.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2426101fac---luverinuzutogevuxoronaxiv.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/70102580946.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a898b790749---40074053967.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/tkhbh959osbokjs4lvmoamh8dr/87909275526.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/50806159982.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210511133835.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/28e6pbt68t8q4g2rr6pidfq8r6/5994206813.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/97708441389.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/36354167551.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bda84daad05---kojuru.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/lowuk.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/093a688257e22ca5e35e41b6c6a6a9bc/kawoxotexajijojevozox.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6bea1847c---jipelaputoladidasibexula.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/68647571569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=overweight+11+year+oldPDF 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_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 10596 bytes
SHA-256: ca7ebe3ff5878c1d91fe7b29e74d777d4de722b042699cf6d447d0957c192193
font_01_sfnt_off000111ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AB 17176 bytes
SHA-256: 4176f5fff9c2f4386e0e203523a355ad9824d11467eb592a898c60b8828f764b
font_02_sfnt_off00013e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1