Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ef9e1ea35cfcfd…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 01:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d57a52bef0f6e8af7a94612f7773ad7e SHA-1: b0a8b6cf927bc99370d7e293ad8649a787147222 SHA-256: 31ef9e1ea35cfcfdb114739bf0709c164fc8061cdf487002981badcecc402d66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=leaf+coloring+pages+pdf PDF link annotation
    • https://dimensioninteractive.com/WYSIWYGImage/file/97692812019.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1d8c23283df86a8bb5c09fcc7b3b31c2/41469169655.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/79722077393.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/59763349973.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/79442198974.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6f5c1bf211f2ab8127b92379e722f62b/14460776858.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/74734729538.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/63312145861.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b3a89ef54---81219177148.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/73944023257.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/joxulexigazapet.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/30583758019.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128cc2f51252---jomiwoxizutadij.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/1bea6c00166055ead8cd21b2db7d431c/89933805505.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecabb97de09---45407257889.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/vexaw.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/jalakokisoxexolef.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/3g1ibrfpq3787ceult1e20crk3/78170692156.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/e98bb0a129e12555b68f174d253e4fef/50598807975.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429044859553942.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/cd6a42703f1a01cab1cc02f15d1f7ab7/42126609531.pdfIn PDF document text
    • http://sinostandards.net/upload/files/rusavovejapugexaper.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313f7e565a4---29467156270.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/tumijogedegakedo.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_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 17320 bytes
SHA-256: 08458fd09d7244040333a3f85c019a4eac44dbee73ca279e2c0e44fa033267b2
font_01_sfnt_off000115ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BA 10656 bytes
SHA-256: 50e3c34f4fad2bd8ed203f4a76340701035dd4c37eed4b6730a0f269d8de83eb
font_02_sfnt_off00012dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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