Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37da0812ed23120…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 18:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a963064df76a5f74bc824f8c81f2aeb6 SHA-1: 099b836887d23b32b75dd9595d03c2eae86e2a72 SHA-256: a37da0812ed23120fabadb4d3226823ce6434e3d5f9bc7d43d64ba6ea94f5c63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://luingpyrex.cz/foto/Image/file/88804171194.pdf In PDF document text
    • https://k-newsletter.com/ckupload/files/midawilifobesifodoj.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/wikukazakotebodor.pdfIn PDF document text
    • http://dalaichau.com/files/fuvef.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/26782658751.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610041ad5b407---27035574911.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/wesutoxalasewejomenefi.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/verali.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/xulam.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/kopepames.pdfIn PDF document text
    • http://denledmpe.com/upload/files/15291740130.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/roditezoseginipiwerene.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a059bd26882---luvumujisofokesoporot.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/328221006.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/27653286629.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607052a7ebd79---nevafobebuzusodorebawume.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/s1k4qu85bsgcoac9fuhakd0p1m/fujaketeje.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/watilenodab.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/36595341969.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/64406938143.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/be0b3f5a49e8f08e5585e6a6fc91e733/pumapulaxezoxejekozixi.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/05dgshaskfmm7hqskds25c4vnp/nujuv.pdfIn PDF document text
    • https://master-service.ro/images/file/47405027805.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d26ded742b0394f31715199f031f061/62142195565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sensory+analysis+of+food+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_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 17876 bytes
SHA-256: 05ac933bc698bbed85dda7d5da5973ecccfd38268e1acf5f96da735ef0f6897c
font_01_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 10580 bytes
SHA-256: 891bd5473568e419f1a401ef04fa0d7edcef118e4b1d48162539570404f9a363
font_02_sfnt_off00013420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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