Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1a523faf1e8c1e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 20:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2a88616d21d64575823f0ea40f13252c SHA-1: 4ab5832324fd99ac57b50e4d08c06812579d9857 SHA-256: 6b1a523faf1e8c1eb598be0c6c903e9dd7c0a517a224e73a132b933592f31df2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://queure.ru/uplcv?utm_term=diastema+closure+pdf PDF link annotation
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b85448a8fba---voxojesepugigiretadobu.pdfIn PDF document text
    • https://irrisyst.eu/files/file/79021918963.pdfIn PDF document text
    • http://crm333.com/documentos/file/pukejolorofe.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/80728535211.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/pobowebamilenileral.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/mamafabubuf.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/kolakitolirinufur.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/badubone.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/bulexawimufotatama.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/gigegavolekifala.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ebd8f6c07515b13dab6498f00dc26555/negesesuwamexeju.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/40757950373.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/nomit1fk6llijpa81njnemsngd/viwojaroxovozotulogado.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/jojenidodal.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3kkdvbn3qi7umb731v7mmau2i6/52321999018.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/0d1827211d1a2cd2dc47fe72490e9551/32008117809.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/5115175843.pdfIn PDF document text
    • http://accronline.com/userfiles/file/julupolewukokafuku.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/28344327641.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/ca024208163aba6a9fb2fa343d1a7ce1/74459530481.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/kasobakojamufitumigiw.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210728_B434FA8B0FDD1B0E.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e574832fea2---riwatamikenizimotibadisub.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/bubametet.pdfIn PDF document text
    • http://gerocuki.hu/user/file/folirovifavexujajufiwirit.pdfIn PDF document text
    • http://tion.hu/upload/file/60945241432.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/sefabexuzazegekefunebon.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_off0000d42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 16232 bytes
SHA-256: d026efb744d76b4ffec6a381edc58360404151a7b4e817e589641eb39ab4f4a3
font_01_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 10776 bytes
SHA-256: 7a64ed77110e718ab24ad97b9468b5a02f532b76e2329fbb369c5da1d4668c52
font_02_sfnt_off0001166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1