Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba3a5fcea2354b6…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 09:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 015f2d868011d90593494a08b9a85bd3 SHA-1: 6fe5b8d780f0369664a745fb566bd751bb88be89 SHA-256: eba3a5fcea2354b6222acd35130bbcb0619176a8d3b89eecd65c92a01163dea1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://mayingiabao.com/upload/files/rixafogulitugipuzo.pdf In PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210919_1E819C689F537880.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/murukebimufemi.pdfIn PDF document text
    • http://newo.ru/files/files/33270684001.pdfIn PDF document text
    • https://businesslife.com/content/file/85713112467.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/detajirapu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e16b863f---texegituboze.pdfIn PDF document text
    • http://awards.nl/img/cms/file/56011539375.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/pujiw.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/85109283443.pdfIn PDF document text
    • http://mopron.ru/upload/files/83763212899.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/rujukabobivowan.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136bad65c66d---53473119719.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/403f9c4ac1f10979b611e933fdb0aeb0/tupotupabusekefuwixuzufaf.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/kowowaronofexujedov.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/venawosexumujotekirosikir.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161429b2d87b97---vematixinisolemobazomo.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/weletupawanoxuxadedem.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/zapowugotoxekuvedawumev.pdfIn PDF document text
    • http://healthywithhart.com/res/file/40004798814.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/55661268735.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/8664957274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+read+excel+filePDF 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_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 10288 bytes
SHA-256: 4d133de539130d8a5ccb63f500ca2f7ff27bf330d23ecffe6e09191faa6203ae
font_02_sfnt_off00011401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11401 17756 bytes
SHA-256: 65ba1693eabc9effff73c7e01c34d52a4b3aadc29ec574ac695c936e09758f25