Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f4ebe0f48cfda2…

MALICIOUS

PDF

85.6 KB Created: 2021-07-01 09:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5a2bace78c20d01467d77f58de5271b6 SHA-1: f7451f45cc901fec7b6bc5a33555f034af1ff4d8 SHA-256: d0f4ebe0f48cfda286348ed23cba8d4623b1b6c295cbdfdb7a72e9772ceaab38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also features a link farm pointing to multiple potentially compromised WordPress sites, suggesting an attempt to obscure the final malicious destination or distribute payloads through these compromised hosts. The presence of these elements strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086744d1a695---somiwipimavozamoga.pdf In PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/dmk7l190v981ldhouoc1qfs1i1/gamorewujuv.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/94173430545.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/woxujo.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/21749406420.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/45071528901.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160779f819f500---70835871168.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/84726128620.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/60101295256.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5bba0fec---20542563745.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a0a732787f9bc5d1512c8680d6f3c3ad/6934005185.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd6f928acc---berakotorutuzudoxatozera.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160814c4eecbbb---matuwijelobukisegonal.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/p130kivq4j0kr4ooi8b723rhr2/lamenanodakuz.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7770fea391.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fd1220a48---76029744802.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/fasopodopofixusus.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/5bccba24ebf7f2d5e6e63205d6a3c087/14854096793.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/higukvqfq20mr1qvu8cgk9jhic/42740248695.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b6690060e2237a32a8866a9957a2a1f4/30346360782.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/64119016987.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/sidida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=measuring+unit+of+velocityPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 17476 bytes
SHA-256: 92fa61c0ae140316df860c2241776c80195719c7735bb554438ba7b64a465301
font_01_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001302e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302E 10784 bytes
SHA-256: 2e152091e5b7c79537573f363636d5ef608e8166dd66ccf2aff8cbd9f47cbe78

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