Malicious PDF — malware analysis report

Static analysis result for SHA-256 170231f2f72fe6b2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 14:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f1fc36515328c917c4ab76af8800e05 SHA-1: 97fe2924a5b9ce5848916ba696c188f2afcfcf48 SHA-256: 170231f2f72fe6b288fc19394e75ea388a5a0869fd98f5c961745686adaf9fc1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm with numerous URLs, many hosted on potentially disposable domains, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://xn--49s538bo8ux8c.net/userfiles/file/dujogutobimiboloxupuwebe.pdf In PDF document text
    • http://perevodvnegiloifond.ru/pict/file/56870752774.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/24221660656.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/5332563851.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/1525973274.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/65828437775.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/kitaxipitumunojabijikesu.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210905/file/16308260874603.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/2592009429.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136bd3646017---70003952272.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1af6170e0482a10f8a8431ec63aaedc7/21005326001.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/95469199183.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/73389721129.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/kazexuweruwo.pdfIn PDF document text
    • https://parkettworld.com/upload/files/27018080497.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/mopipidibosovegu.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/irff4t03m3a7c53u7vp2gv0baa/tepiranazitakexaxikipot.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/84102683526.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/togudabexuzu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e60a22f1d---mezupunuda.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/30235391388.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/78454940789.pdfIn PDF document text
    • https://bloomeng.com/uploads/julusalap.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389c0de2765---nebajixonotat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=reboot+into+recovery+apkPDF 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_off0000d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 10612 bytes
SHA-256: e5cb9eac79a2f51681a13f7c17ba08197a78a0837e2e2051be11e42d6a884135
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 18164 bytes
SHA-256: 55763c3e3d5d455ea2ef9a8a89e6937f7302b89b850a962be23cea49e1091d32
font_02_sfnt_off00011db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1