Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bebac397d032d1f…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 17:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 62160f73032dc7882550f1a7bd1949ae SHA-1: 2188651a04bd6760f6d41d65c424334a5e845334 SHA-256: 0bebac397d032d1f630d6e59141cf9a20d50828c311ff14782f9cc49888d4989
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external PDF files hosted on various domains, some of which appear to be compromised WordPress uploads. The primary purpose seems to be redirecting users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://lienlacanien.com/img_pages/file/xuganaka.pdf In PDF document text
    • https://healthmatters.me/userfiles/file/lozovej.pdfIn PDF document text
    • http://minhanh.com/files/newirarejerogiwoj.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611cca98541ce---95694057732.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/89031484807.pdfIn PDF document text
    • https://marosme.ro/hirek/file/kibogoj.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16211564944113.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/94354866615.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/7spj5hh3eucdgo0ntg3vp8m9dt/53125423209.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/72099902981.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/malexoromitoj.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607694497443c---49486274059.pdfIn PDF document text
    • https://partnermind.cz/images/files/detodudomoduvapeloluze.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/82093765790.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/sinisixokorupalu.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/36485166923.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210720_3A8BA42D49D5451D.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108da7b2daa0---rewozez.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/nobixajonuvopakege.pdfIn PDF document text
    • https://adikkedua.com/contents//files/5607908200.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/28987628013.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/caeb202f83f4b6e5e5991fa5d1e5539c/41372303007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=errores+gramaticales+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_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 20600 bytes
SHA-256: 5dcb2f91d3ae8bcf78417d7115db6d0a4769b3806fa16e1ed8ed0e0f74e09840
font_02_sfnt_off000128ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128ED 10840 bytes
SHA-256: 125b630ca22355f6e3f98c686cd7cc9493e9e00e6be60a08f4f7e20fdd918aac