Malicious PDF — malware analysis report

Static analysis result for SHA-256 588027f4056e27ba…

MALICIOUS

PDF

101.8 KB Created: 2021-09-06 20:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a487a636450b74d5da5351ad4398dde SHA-1: c77d3ea87a976d387ddc5e2115242bdbf03de5f3 SHA-256: 588027f4056e27badded080b91cf2f8e69fe1cc41c1cc455890ed749562cddd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, which likely serve as landing pages for further malicious activity. The primary attack pattern involves redirecting users to these compromised sites, potentially to download additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://wastran.ru/uplcv?utm_term=appreciation+letter+for+teacher+from+student+pdf PDF link annotation
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608044afb1512---42056313336.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/53933825082.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/mumisuzisovafi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/8bs0khifn9g5ka55i878qeed1c/tiposuzebedugipofutuv.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/99781485527.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102782a50815---xikemidibabadeximidatig.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/selususerusuzidemefakuv.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a419af79499---43558027131.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/41322882338.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6046ec1f19---lamipebasa.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/cq5va78b2c7v9gqjq7kvjh75oa/zekuxutegatab.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/54570048308.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3981cd281---pepukumutotuvizijunin.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/37b96e82d0aeb6f03e3f55fbe36da433/80424917671.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8b57b5f0bd9aa6dfb81d0ff477f7ac28/tulasizenuradin.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b65fac5205a---60450881643.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/xafape.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/5mt65jrbprsj2fl9hce2ahhcq5/vefegosirukevaj.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/70607587486.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/986022c15e3bb8dcdcc14202db254c11/mevifate.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/55894298734.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6dadf2ecd---rigifuzokumi.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7ac1db00f---nadevunajiv.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_off000127da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DA 10964 bytes
SHA-256: f244f47ef8cf1bcc6c07bffd31312bb79b15dde1d4edc4794b61349ee83806ec
font_01_sfnt_off0001411a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001592c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1592C 18492 bytes
SHA-256: 084114b6fc2c3cb7b3a7d2da82505b293b9a28ed2007961b01f4d0cff6c94fd6

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