Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef07f943407cfdc…

MALICIOUS

PDF

87.5 KB Created: 2021-08-12 11:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e73d54b56d2954f8ab1ec80c29ce53d7 SHA-1: 9f507d3a2d7589ccf24fe6999091d0de8a9ec8bc SHA-256: 1ef07f943407cfdc6a91e9fb74fbc0c7d14c5fcbd6701fff2bff9da478f1081d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+to+order+notes+from+prepladder
    • http://valeneighbors.com/userimages/perajitez.pdf
    • https://cortemadera.com/wysiwygfiles/file/53172420407.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c41ab67aca---dajik.pdf
    • http://sigep60s-ncbeta.com/clients/44785/File/38570409620.pdf
    • http://gasnguyenanhst.com/js/ckfinder/userfiles/files/54399028654.pdf
    • https://behbehaniprojects.com/uploads/files/pemopaxomefakopireporusok.pdf
    • http://luatsutiengtrung.com/app/webroot/uploads/files/18939925922.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/0325847a79f41dc22e59554015e06974/60524951877.pdf
    • https://yptea.com/data/fckeditor/files/bajewedujavoxijedafinon.pdf
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/bisupedanavojisuzabeb.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd3060e52---74921472642.pdf
    • http://cl-pub.com/files/files/boriwutegovusedafefuxewe.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/72dac08117fbeba8fea16492c9649fbe/6530316064.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/19089787432.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/33837709586.pdf
    • https://alternatifhirdavat.com/upload/ckfinder/files/jilitamilepewininekopegij.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/4715e7605b7df80e14c2ccf6c7fa1d70/povobaw.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607882f093bb5---kesabazogumilezikezezobeb.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16072cacf2903f---40264368525.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098372201cd3---vejukepelisabimanipin.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/087f07a39b15ed074844cad40b187b23/tedub.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/025vbbitc9p4plruc8fpgp8q31/85441760382.pdf
    • https://viettrungson.com/media//Files/nifotewafuvexa.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089a0f15c2b7---64990056746.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ed29180c70dde782b584e21cf21feff7/45220213566.pdf
    • http://cpghollywood.com/userfiles/files/saxigo.pdf
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/89003860955.pdf
    • http://whuntex.ru/userfiles/file/kipigesorobariku.pdf
    • 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_off0000f105.bin
56272fa7f73f2928c83339253e4487cf8ba01d92b5e1ecc18730782518909cb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 17892 bytes
font_01_sfnt_off00011ff7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF7 16792 bytes
font_02_sfnt_off0001380e.bin
0a41b8b48967135ffb35c2b5ac863da8c4f9a051182f924c7b4a2b22e82a1457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1380E 10644 bytes

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