Malicious PDF — malware analysis report

Static analysis result for SHA-256 336d7c5f947d4e01…

MALICIOUS

PDF

94.8 KB Created: 2021-06-30 20:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c88192a2ad522805a0acc84be281d9f7 SHA-1: c3d1c93b8fb836cad8b2d3c37f9d1532333136a5 SHA-256: 336d7c5f947d4e015b06fc937c66fd50dd34434747f36aa07064c5cba8b65118
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains or use URL parameters suggestive of SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution by directing users to malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://coretry.ru/uplcv?utm_term=how+to+become+billionaire+pdf PDF link annotation
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b683e797b63---regekofurepekudego.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/34cda3fe098ee3958b6259c8642b4fba/lipefefurepagimugelipelo.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6925fbd7a2---lolilijuribogozowevifis.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607217fae0b43---14091325542.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a97aa47ed270fc7451ca7971eeb46310/rirubiraxunogotire.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/vebufadenobabaxexel.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/717e793466b886b8caade0b89f4a9e2e/retunovunogutune.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210610005512.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16083a93e8f945---5075346912.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/59fd039fe8bdd4630955883d52f04c2a/todusijokenowasitoruju.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/71732275934.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8aeef5f5---wuvasabiki.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a89faeba25c---89823093030.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ef530aac0eb7e769edf92921bf13a64a/venatujan.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/n3qv2d6vb36b0e8hod2l9opsdg/mazalesut.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f2564a3d---gadubuvetovaw.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/8vskhc1u2h6ebjrs823apl5hb5/67378399618.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160753ec9670f6---98012629083.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/goxade.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/58371500114.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/v6c7o1hneesr8sg0mqfi2tvl8g/makafuxidupifasefu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160adfe880738d---4048094796.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608375adcc8e1---kivupiv.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/88241180913.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_off00010dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 10832 bytes
SHA-256: dc2671537b0afd9c27bde125219d2621c9bbb2221300434c46d3ef0013650ac6
font_02_sfnt_off00013ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC8 18264 bytes
SHA-256: 136d5cdb6e18eada971465d0d4109ec5049bc095114dfac1bc640e67953413d4

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