Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38e6268a6f4f7a9…

MALICIOUS

PDF

100.8 KB Created: 2021-08-03 01:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 0bbeca4b96d88a46e0f11e3a9de9d42d SHA-1: c10e81a6ffae86c8f77a2406529a47d97a0106c0 SHA-256: c38e6268a6f4f7a95d797154573889f9a9ba5848b433dbd0e331aa8524097510
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted from this sample, but the extensive use of external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://medvor.ru/uplcv?utm_term=bts+bon+voyage+season+4+ep+3+eng+sub PDF link annotation
    • https://santechnikosdarbai.lt/images/files/66767483166.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/puvegaxazixo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f68a2d3d8---fibagifojapamuv.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/b3a2f2973a70eac7fe8569da4b7a0b63/nedoso.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/60059061057.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/96224184777.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/90408369520.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a849ef68298---sojozuramesolukarapugi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be7e152f4c6---gutijupe.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1495aa66---kazabam.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/81099628893.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/68442660477.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210628_045829.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32896fc28---kubovewenupebaped.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8342f511b154c8b8b26ffad35e6e99ed/xilaxeranatotef.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7f6ede7a044c3de70697b5aea178f03e/65496873296.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607432545f190---90780558988.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913dcd4d469---kolejowafida.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/vaxafaxili.pdfIn PDF document text
    • https://bczenekar.hu/files/file/73600831548.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/wamonalodofuru.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/380c36cc83552a48315fa70f8c28f9b0/50771733418.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/lorurogulomafe.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/38359198684.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FE 19508 bytes
SHA-256: 517db89adfb4096c16ab048a7a633ddda173eb65b207f023540f6ef279d3f66b
font_01_sfnt_off0001499e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161AB 1788 bytes
SHA-256: 586ce7b0a1bc9ce32488d2542a9228394fce318035e078ddb3279642b9ba1745
font_03_sfnt_off00016a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A16 10912 bytes
SHA-256: ddc9b93b8a2332b3b4ff2b71dc77b919c05f8e3a33f9d1b9690652e794355a38

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