Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ac48f6646d6eb2…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 03:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbf57e87350d66428c99e38c377a715d SHA-1: a7e0f4c40d9246508fcef886a1ae83aa7ecd7901 SHA-256: 20ac48f6646d6eb2fafda017b1b155017fd32cab9b832764c5e1041b1a15e904
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, pointing to various domains including compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect the user to malicious content, aligning with T1566.001 (Spearphishing Attachment) as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://smidgel.ru/uplcv?utm_term=send+you+love+to+your+new+lover+lyrics PDF link annotation
    • http://dietetyka-24.pl/images/files/33637509851.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dad425017---88404608949.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/99119127103.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/70920031651.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/56465323679.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107241745346759.pdfIn PDF document text
    • https://fallsplat.se/file/27601085854.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05c229e1f0---18325947442.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/bca3bacc9dc16c226adb38bbdc47345c/46678743103.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/2575705082.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/wofuduxopo.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e448805abebbd53befd003620c19e89b/bularegunujewojupa.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/nutexoziwaxogajavor.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/mipenerukiru.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/dumebemopela.pdfIn PDF document text
    • http://ledson.ru/upload_picture/pularuzawavikinisaforim.pdfIn PDF document text
    • https://lapakunited.com/contents//files/petomutimivavowepof.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/6885318746.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/rasazujizeba.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/250619123648.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/40236263056.pdfIn PDF document text
    • 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_off0000c796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC796 10640 bytes
SHA-256: 969886c583fb29ccf994b1c4f1a9b710c2754e6fd58090428bab5e43f1f971f7
font_01_sfnt_off0000e019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 16708 bytes
SHA-256: 42740ba57f7c3aaf04b406bf72cc49384227abaeff95fdc1d9781c99392231f0
font_02_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1