Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a385f9990a3a4fd…

MALICIOUS

PDF

84.8 KB Created: 2021-07-04 09:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 53650ba14d92b72d3f3f79e70f0202f6 SHA-1: 4d6027ace1ca6357871e224bf61c9a4e796ef871 SHA-256: 7a385f9990a3a4fdc19ed9b65d6656f58b2cdabed7dc0ccda814ca9b0416cf1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or malware downloads. The PDF structure and the presence of multiple links on disposable or compromised hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://betenrealestate.com/sites/default/files/file/wumuresixajijukefususos.pdf In PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160baf4fa49fa3---24252525568.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/jju5vf3gl60j5rjfc7ftgv7rbg/89201157495.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/xozulorofoxefipagenub.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/zoxaturoturezumex.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2aa10ddd---livusan.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b31f3e5656---rojunaroken.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/69421224370.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf3973714---sejuwivifilenozuzewe.pdfIn PDF document text
    • https://aedwea.com/upload/foto/nevamegexaxelugufezi.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/deniletoxivame.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4ca01624b53dca0dc51385846a3e9f77/31036211701.pdfIn PDF document text
    • http://turnyras.lt/Files/file/52783407864.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/26987046f6be46cc3890b6f92fd296c2/tuzusasapoke.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf431ec53---2847359509.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaf1d4251a---50204665635.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607525c360f03---19251521140.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088792073e57---piwudonodazivosizemorom.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/39770fb7a9a0ba299350d77379d595b0/9889539597.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/88208690302.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/399eeffa00b6ae113f8ebdbfa6913ef7/dufoxenozobugor.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/04c27e7d99ef463ad130dfa2517ad5e4.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/616c366377ba507e60e506d90b6fc4f1/84570614857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=phil+collins+somethingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF81 20080 bytes
SHA-256: 7b77860f2ce5781ed04c73c9898b351773f89ace6faa022cbe5ac4bf07d2a621
font_01_sfnt_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_03_sfnt_off00012e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2B 10416 bytes
SHA-256: da9f72d54ecbc9a69a567884d3b94512f04ce98395e27627c179941b22c90663

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