Malicious PDF — malware analysis report

Static analysis result for SHA-256 86dc8d2a1ce3ec86…

MALICIOUS

PDF

90.0 KB Created: 2021-07-29 21:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dc00a5eea742335fd74fc063dc46d924 SHA-1: 67b4edd41d49b49a0d327ec94e2b8b0cf883a9b0 SHA-256: 86dc8d2a1ce3ec869cc0aba7a3e858869524a19a99594822074d8e81133deb35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/010ct3lij8k9g8tg5s8l10ml2u/sigawudulipenur.pdf In PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb3d6ca250---96755001630.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/72242dbf7640d588afeadc68cd457e26/laxiguweve.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/16807083155.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/58953257719.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084c613878e3---88421863655.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0c97954a5ec0be3611b51d7fa77855c6/74793282918.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/24727275533.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/f2269b8o6j7g6d6pq4fsc9cd1q/82438969166.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087c4e6a78a6---79353230104.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/43142757332.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/wixifiwezelarakibezajojed.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda136f3c8---nemevimup.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/90604969147.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/bixewamobeteko.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/razefapiw.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724af6c3f38---70037208785.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff7dc33945---97037045224.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087707e858a6---lajep.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qag3pha74taqsiaqrbss1krr30/90765560432.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2d3c778da49f484256368da9c785f960/26672430533.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/39784093113.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/f28b0325df4cf28b9fba7b75961e7094/56620097390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=do%C4%9Fadan+kayisili+form+%C3%A7ay+i%C3%A7indekilerPDF 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_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 18944 bytes
SHA-256: 19fff669afd78ba6e3c90308e03956eedd8ee953fa9c51c3dc0f12fd298c2708
font_01_sfnt_off0001269d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269D 11056 bytes
SHA-256: 5696a4a88d58ab3a530f889496eec409f05cd425d6af4f1efa3b2db653b79134
font_02_sfnt_off00014022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1