Malicious PDF — malware analysis report

Static analysis result for SHA-256 41332930a766119e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 20:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f02d1d81f28ff0331ae9bbf564977fa5 SHA-1: 5c389c8bca7316a3cd4fb9f64c8f68bc922a1172 SHA-256: 41332930a766119ed3cdda7b458bf7907d433bf09eb1235df1ad9d4d5da312b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS upload storage and 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. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://auto-rujo.com/images-editor/file/puvabanojexose.pdf In PDF document text
    • http://tourgrodno.by/images/content/file/55524157022.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/19661178142.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/6202072309.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/i472q3dk1m6gktvhg6or35o9th/moxerarovojo.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/sifubamawex.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16083c11a170d2---lunozabela.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/4r1dh47eamb5dam92fgp0r3f6g/zolokovogunevabaje.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ltgvkfrvefr3br97q5sho1ci71/makumirusaguxixax.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092f2e6dbbd6---21384223237.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a96a5a52d6a56c50e293b64536eafe4c/34375038612.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/46335270609.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/2r98o50ltit5dt9869pevsolgl/42943678128.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8885ee655a---pewajobejujod.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/nowijexagakowol.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/kezijapegamemimukasepelag.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/e4f5269bbb7be9bb5c40d53e23a352ff/womipekasaboxa.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c06d2c83e2---puledunufuvageva.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/94330565dbe365d01874e92cfdf143a5/80735579681.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/tamus.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7edcb3984c13acb493729a2ad5847a30/tusefonokixekifunafelikux.pdfIn PDF document text
    • https://cavalier-king-charles-spaniel.ch/userfiles/file/zulufulujiziletumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=200+robux+codePDF 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_off0000d666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD666 17184 bytes
SHA-256: ee685d3197e1f549b6021c5b478a774f50e30bc2dfe6f4cbda595189c12305ec
font_01_sfnt_off00010314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10314 10180 bytes
SHA-256: f8f6b9ca1152cc26fb7e180af25b15d84006f31f1c7a50938adf6b55292863ae
font_02_sfnt_off000119f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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