Malicious PDF — malware analysis report

Static analysis result for SHA-256 574b0af551adcc13…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 14:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a0fb61d9001f7e5e1b71882710e9035d SHA-1: 84704c5d191e28307a42bf2db5677ee260a590f0 SHA-256: 574b0af551adcc13b0acb1336f97acb25db94e171fe5490ec0c8b06d258995d4
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to lead users to harmful content or exploit kits. No scripts were extracted, but the extensive use of external links and the ML detection point to a malicious intent, likely related to initial access via phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=modelos+de+curriculum+vitae+pdf+para+descargar PDF link annotation
    • http://owv-sad.de/userfiles/files/bumoxifopoluvabokof.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09f9d84c1---69800976981.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/58168813345.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/61797398109.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/vpdtee3m0mgfkj970i01rfl0te/56301708244.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca71c38373---19431991850.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ba506ccd58cb2de95a53e2078a77447d/laxapifotap.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d908ac1ab95---pesizigosodag.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16128ffbb2e49b---jiwoziperat.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/remubojodigi.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/disitomipudawurob.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/paziwe.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/63810981896.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/83519915865.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8769c6b39---loludufibolusuf.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/8f41c36166414bafd16fb1c734b92ddf/dozekelovaxejezosez.pdfIn PDF document text
    • http://packamate.com/userfiles/35661870015.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/0bb8c670a154e3014402bed6598dd317/walerasik.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea173ae605---kiwawidepaju.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/44311500442.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/96923316615.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16102e26bf3905---pinitubopig.pdfIn PDF document text
    • https://cecprint.com/images/file/bexefob.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/paboxo.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/90269471970.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c975a2c62c5---63703959744.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_off0000dc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 17192 bytes
SHA-256: 0bc76dad9f8b9a9253331daa232af79874dfd3223c7da6ac18c200664ed5167b
font_01_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE3 11016 bytes
SHA-256: cc0ea506735a466ab423ec7e75403085c68d6030229dfa6798619fb24d5d6207