Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d240437d72e4b8e…

MALICIOUS

PDF

74.5 KB Created: 2021-09-19 06:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2130014485f916113a5713393c98c43 SHA-1: 0a7cd33a76e5fba625dc699e642a33e10e5015eb SHA-256: 4d240437d72e4b8ecc540e3f7d69497e68f184fe97ff4f92705859bcf3b6e680
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394f55ab95f---84605807098.pdf
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/37061024015.pdf
    • https://responsible-tourism-alliance.com/content_file/files/nirujamuki.pdf
    • http://aodaiminhhanh.com/app/webroot/uploads/files/leredojegivegavorexifuzov.pdf
    • http://lamelove-zakryti.cz/userfiles/file/nifisituwogamujitirodu.pdf
    • http://www.ez4parcel.net/upfile/files/2021/09/16/75139193705.pdf
    • http://turbotechnik24.de/userfiles/file/gisuke.pdf
    • https://sunpower.lv/ckfinder/userfiles/files/38353520415.pdf
    • http://gruaszarate.com/ckfinder/userfiles/files/50630031565.pdf
    • http://cansuyu.org/resimler/files/sexuwuj.pdf
    • https://www.sistemkabin.com/ckfinder/userfiles/files/dixozupiliwurejifonasagab.pdf
    • https://livres-d-art.com/ckfinder/userfiles/files/waxadenivazamatorefuwoxob.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161428860ddfc1---86076350608.pdf
    • http://hexindechem.com/upload/files/bigotimilatesamagexomawu.pdf
    • http://sabancilojistik.com/userfiles/file/25451730212.pdf
    • https://morethancars.eu/uploads/edytor/file/livinarodovunuseposonovem.pdf
    • http://whitedwarf.ru/public/images/ckfinder/files/79524099578.pdf
    • http://srs-budapest.hu/uploads/files/13664389369.pdf
    • https://anandamsanyal.com/userfiles/file/gudotejasivusero.pdf
    • http://thedewakohchang.com/image/upload/File/3225005523.pdf
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/radiwifaximamurox.pdf
    • https://areicon.com/images/file/8695853112.pdf
    • http://dalaichau.com/files/suluxilelevugewajobepulon.pdf
    • http://a-swiss.com/upload/userfiles/file/lupuzifowubanejunupojana.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef7497728---44855435764.pdf
    • http://moveworldtogether.com/datas/files/ruxemazazifazag.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8891662e5---60222989896.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+torrent+file+downloader+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c02c.bin
406f9f4012eeffe104e99f9cc729951d4687d368ece0cac9c092bc8c6ab20b74
pdf-font-stream PDF embedded font (sfnt) at offset 0xC02C 17060 bytes
font_01_sfnt_off0000ebe1.bin
4f0458cc2410aa1b2e27fa804df503174cbfdb82c5556c483734905fc1a7200f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 10484 bytes
font_02_sfnt_off000103ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 16792 bytes