Malicious PDF — malware analysis report

Static analysis result for SHA-256 1199bb1eab5f96d4…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 16:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d30654deca486e45393813ccff2cd4f SHA-1: bf622e5cfc70ce3da332ce32b043b682b967f191 SHA-256: 1199bb1eab5f96d46da8866b31ca0d2c0fbaa1dd7eeb671cef115a2546874a2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to distribute links to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=y+city+apk+download PDF link annotation
    • http://bytip.net/filespath/files/20210911175057.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/54111703800.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/molix.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/97579589570.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/tuginuvojixejigimopijojuj.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139251f89c7f---xibim.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/30356779195.pdfIn PDF document text
    • http://www.rarlaw.net/siteuploads/editorimg/file/74958710376.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/33809685756.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/dozilose.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/434ba25bc2a7271a608ca1ac90cbcb4c/kizata.pdfIn PDF document text
    • http://zimmerei-possert.at/dakedajera.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/7fd19f54b3f36c63422553ebf4d7c6bc/fugazigufenojakafiwi.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/nidelewenugemi.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdea33bc0---5130081337.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/36866198632.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc623e27eb---42100487628.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/22909061106.pdfIn PDF document text
    • http://jngf.cn/files/file/novapatukafixi.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/vudirezudisozosipat.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/nevojabifuwobefotafuze.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/43505963922.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/vd4ak98i8c8qupdnbg2boj3mk9/ruwutatitexadofibep.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_off0000b235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB235 15532 bytes
SHA-256: 30cdc546aa81d94eab12a8cf2a8d9c12a4612c84f8079cdaf95ef04c9cbb6ef9
font_01_sfnt_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 10380 bytes
SHA-256: 1174d84e7eab668a69f8b059e35dc3c9e2ff098202ff5e3615961eaf04637369
font_02_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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