Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfee0cadb2b9bd4…

MALICIOUS

PDF

101.6 KB Created: 2021-08-26 08:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7de337c0a84da00a060aa906fa005514 SHA-1: b35b3fa3ddb3eb1a84ff4a320f29ab197ddc5fc4 SHA-256: 4cfee0cadb2b9bd43df5fb0fc839734733209b3c820d4280e02b85dd35a99b8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff2d3dc603---safefidomorufibup.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/8307925047.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fn48s6iccmi40aqa4ilaqeil42/rufexolaluzezusetixadoje.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/2541887311.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/gupekadafalilog.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/flto3mo8j7rvveq534bqjmjvj0/puwafevopeke.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/1a406fb0b77a957d8cbe1bbcf62c131f/fopodukegonulusefutuxika.pdfIn PDF document text
    • http://topas.lt/userfiles/file/60127707085.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/79015796405.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1b7e92984cd79caebc48096e70a6a14a/73050546572.pdfIn PDF document text
    • http://jingtianlawfirm.com/images/uploadfile/files/61379820210.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/fls6jtcv9uespbogkhmt5r79l3/75339832788.pdfIn PDF document text
    • http://school15-tyumen.ru/f/muforerebixalolitati.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/837336d277685a4eb8815117e24d17a3/jefalonelonu.pdfIn PDF document text
    • http://arslanemlak.com/E/file/51907143693.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/2601173616.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/95886843425.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/23105827762.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/bezegawajof.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/46595231500.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083363169758---pavotalamesi.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/c3b453d58734eda95c15986a68fa7837/zukobaliganabuvub.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0539187e07ea6a17869108caf685848d/kurimurixotux.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/86349483703.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/vevirotuxi.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/mutuvodosererol.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/mapumugevamewasaduvuvimid.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/31921453103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=reticulocytosis+without+anemia+dogPDF 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_off000127ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FF 17248 bytes
SHA-256: 9c9d7cfdea8d74e94ca19fab72e1e1f37e8a0993cfca29785e2481abfa71fc74
font_01_sfnt_off00015513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15513 11060 bytes
SHA-256: 41d878b87d30f49eb38a650ba9d1a0c0fddf5e57ad3181640c863052b165634a
font_02_sfnt_off00016e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1