Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f88b89820d2352…

MALICIOUS

PDF

88.2 KB Created: 2021-09-06 17:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f5f878647433b591c4a3e2b65f2aa839 SHA-1: 772b244d639b714dca601c82b854ce556e5a63a3 SHA-256: 46f88b89820d23527a7e95c7e0f2f3d75ba29b26d1add4efdf5317a6504bbc36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript may be used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://allytemp.ru/uplcv?utm_term=hyperlink+in+pdf+einf%C3%BCgen+acrobat PDF link annotation
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9c1dc6da---65640305328.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210821094455.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210806042346923037bg1sm7114jrp.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/99336243494.pdfIn PDF document text
    • http://novichiha.ru/pic/file/xobokavudoxo.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/viijsjupld2pcdotm9c9n0kles/64688925456.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/wujexabifujeva.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/solovezokonovur.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/burukerisupolagiwudeka.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/dakopevelekowowifavotola.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/38a0ecba9a7696578b277bc9b396def6/xuzozinutebukapufegezu.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9bbd0c3fd---kazovolujiwow.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e00e3704f8e---dowomotu.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/jokulalunixalukiwulavise.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/tazurowujuped.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/lobilixikobezonatuw.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/31303612025.pdfIn PDF document text
    • http://recrute.fr/files/files/62597287705.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/3211713720.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa57cef86d---50631989245.pdfIn PDF document text
    • https://datawire.gr/files/files/xurodidatuzij.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/gerezuwuridowadafibaxo.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/winexuwuwebujafugale.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/14045814181.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_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 11156 bytes
SHA-256: 7c05fce9daa43a190560427c199046148326d2bdce75bccdd05e04d9896a4b0a
font_01_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 20248 bytes
SHA-256: 6ead236f6d86516863041441456414c6d96ade0673e647aeab427d0de80a5afb
font_02_sfnt_off00013900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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