Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1501c8b47359bf…

MALICIOUS

PDF

84.4 KB Created: 2021-08-07 00:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09b26ff899dcf7ab450ce75a6799aaaf SHA-1: dc94444b0d082f9b41c49c1b37536a23765ee00b SHA-256: ec1501c8b47359bfdd7573413b73bdc37516547982844b3a33f869c146f90b2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing a link farm pointing to multiple compromised WordPress sites, which in turn host further PDF files. The presence of ClamAV detection and ML classifier flagging indicates malicious intent. The embedded URLs suggest a phishing or malware distribution campaign, likely using these links to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/9c2305b30de4c0a900caa65b7a8d9499/85681728385.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab806f354d4---60993564914.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/7dd22e265e0479512c8d7d1ce6e819f9/19896668643.pdfIn PDF document text
    • http://teresachild.com/upload/files/mifudukebija.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/46342063292.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dcbdbaee3---forelopirafiviputumifip.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081eed01c4d5---varezi.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210717_E44056FF506A5E79.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8895e9bb3d544645fbc91f4f8ccd4829/93564360642.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160dc68ca94703---33961701526.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/58fb117703df07ffb0cbe3c752954a07/62690889162.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/26470768614.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f35ac41fc9a680ad9819ec980621f677/90692550649.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/lokomobijamavisameto.pdfIn PDF document text
    • https://actor-conseil.com/files/file/pomomo.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/55914055308.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/70554303160.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/tefarotodesowadexuwo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c807e16452---domizomivowal.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/loribewebeziga.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c18e5be85cf---23989929606.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa077ce9b9---10594707896.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/wogewodiramewiwopilag.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/45557920220.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/65039561413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=gods+of+egypt+download+in+hindi+480pPDF 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_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 17676 bytes
SHA-256: 7068f41c821bd4304d1e33c0cb88132aadeca459daf20554c10a434d6d01306a
font_01_sfnt_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 11324 bytes
SHA-256: 28d792c603df1c828a88a65ecac9633e7f70dfc5be542e1982fe532823aeaa9d
font_02_sfnt_off00012a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1