Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa90241cb39d28b3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 18:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03aa29e0a6f4a7916922a8e80e6543d6 SHA-1: d6db07a0ec322b448994b19510d03c21a1f9fef2 SHA-256: fa90241cb39d28b349c0b8a72fc8325de4db064421e30ce89c6488ea3b45d560
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest it's part of a phishing campaign or a downloader for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8688232e0---tupibamifimikezadovodag.pdf In PDF document text
    • http://anhhieu.vn/hinhanh/file/66300762432.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337bffaf7ef---tokuzilexejomudiwami.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c13e93b3386---wowob.pdfIn PDF document text
    • https://incense888.com/uploads/files/202108180128411882.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/kujogun.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/90140836868.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/200593d5e915feea6611211b1d231186/44520295950.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/79308352357.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/pisegajome.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/25447521336.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebba56951a---25065950089.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/8bd26ab86ae57655319bde6f385b9f87/81371884863.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/3a90a057fd5d6b460113b801b0451bf8/zitesipoj.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/kelanerelafapanowenemu.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/dq0eogngobe8cah30g50mof2r4/44562002274.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/sefivovuserukofowuluxele.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/53dc89b4cf0fb2355e761694f6209ac3/fediku.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607241b1eba7d---bufanazefufumujime.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9c4f91517---37770682922.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/75401068624.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/kukotuxijigifusivo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/595d4b08c58cfd8b5790e46eacfab446/1777505609.pdfIn PDF document text
    • http://change-sexy.com/files/files/22178506280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=harry+potter+wand+collection+book+pdfPDF 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_off0000c565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC565 17196 bytes
SHA-256: 7b2fe6a0079d458a429e5646a0432c4e3bf65a05d7c778cf40ea2984aecb48ad
font_01_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 10868 bytes
SHA-256: 12430b22ff5d007dae326e87b37446636e64425c537ea968949be517b9d2372f

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