Malicious PDF — malware analysis report

Static analysis result for SHA-256 824e34a9a22c05aa…

MALICIOUS

PDF

91.6 KB Created: 2021-09-02 10:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 275d476ed2bcced9ed51a93f11c18317 SHA-1: 2c2c83514a7f6916be560915056f5f6258175223 SHA-256: 824e34a9a22c05aa18e5af7fd8e4a30c7da744acf34f34b3ffe871cdb65299ca
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=bigfoot+family+full+movie+watch+online PDF link annotation
    • http://samuiluxurytravel.com/Uploads/file/maxutozap.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/bivoguwosefonexibudu.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210801082249.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/07ee986d70e1ebcfeb09d26fcd67d091/gudabudewo.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/rubixixopuxojagotosub.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/20843154404.pdfIn PDF document text
    • http://home-plast.ru/foto/files/gufawaralobifojebebaper.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb11b34aa3---kotaxinopopiwoxepozap.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/539dcb58119cb6c221deb379cc42f3fe/44244158134.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/674756a8ced197b7be8f25686d6002e4/duguwapa.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608502d65c0b8---fuvaleriwadowoda.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/wulitilo.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f28d4d2e35---melarikewejomorudokivum.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c41ec5570---gopexetediwivubopemod.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/58555516224.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/43139009511.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b750dd54d---93545494698.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/19152719414.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f676d811c6623df2f3f31a2a6bdccf9f/67122378475.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/legerazobujiwizebejejopev.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/3erkhfm261i03srpk4ogvjkirp/relulalukijunab.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/bokureralibidewadivajiro.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/datisowoxewoxawakusasiz.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/2p7rseoduei457pklho7hkqv26/9757798344.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8fca95c48---31927382601.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/93968796588.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_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001193a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193A 10932 bytes
SHA-256: c3c28f07fce7ccd4dd3f555fb53a98c3b5ba6ef0c7336a1bf6c2115bc8edd4fe
font_02_sfnt_off0001327a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327A 17744 bytes
SHA-256: 52a4a566002efaa731602954ee176102d71052ea6d0882b2cd0c51d8cfbd60f5