Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe49aea1e85b363…

MALICIOUS

PDF

73.0 KB Created: 2021-10-02 08:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5ecafa47e0133880703a1171e83a33a9 SHA-1: 845f20e197b5a644bc61b82fe9b3bbd5eaa4d0f8 SHA-256: dfe49aea1e85b363a38a71346a2183f2a04728f999a068c7d13d08e493fde003
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several heuristics indicate that these links are hosted on compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=word+premium+apk+2020 PDF link annotation
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ecd89945bc---379786330.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/vulexu.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/zanifurijixapixagolufapa.pdfIn PDF document text
    • http://jainfarms.com/uploads/67064375901.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/49356144733.pdfIn PDF document text
    • https://saya.ro/app/webroot/files/userfiles/files/todatujovi.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/metajozorifepumijitut.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615299ceafdb8---86379956107.pdfIn PDF document text
    • http://esistore.com/userfiles/file/zunumuvilagudunelox.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/60097676072.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/2109161322396835803ijm5.pdfIn PDF document text
    • https://panoramabyty.cz/content/87520775523.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/ramigudovewenuralivefobi.pdfIn PDF document text
    • http://underbutter.cz/download/foto/wigupegobu.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///nuvutobo.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/24646875771.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/47824205454.pdfIn PDF document text
    • http://servmed.net/userfiles/file/90596151194.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210913165625_852597254.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/sekisa.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161507da47b604---tajavisumavotagizuparita.pdfIn PDF document text
    • https://hobbypet.cz/files/file/megulusaduwinexakopufudes.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/78077635339.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/46807335013.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/falilagusanabomemevazuz.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_off0000b72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF41 10564 bytes
SHA-256: f621fa5cc0ff272800211d7e52b85c4a6e5e88be34152b61a96b4e501a3ebdff
font_02_sfnt_off0000e75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75F 17580 bytes
SHA-256: 55518b7ab9c429e0293fbb77ff7fc2ef02d41bb154ed282af66024dd4a5bfc76

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