Malicious PDF — malware analysis report

Static analysis result for SHA-256 954228b3a65c3438…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 10:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 55f1fc69cc1226b323a171250ff94d62 SHA-1: deca8440cfaeea636fe1b0786efe3e83bf0ac08d SHA-256: 954228b3a65c3438360c093ed4b280a623cb659da95640c65439d5b2eca3126e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, which serve as a link farm. These links likely redirect users to further malicious content, such as other PDFs or phishing pages, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://observatoire-omic.org/documents/file/19260140355.pdf In PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/a653ff846b1a0c65d13e8bbaa80141a8/tokas.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/14975130346.pdfIn PDF document text
    • http://babamoleskine.com/files/file/danada.pdfIn PDF document text
    • https://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/85666563702.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/88597503283.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac557c17d---xowanuxiwe.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/83944d69f19fb3f3f8c02844c1decf0f/55942508681.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/p7q4bvmtbr73b7b31vkt7kqed7/logojadopilovoked.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/sulijefuxedurobumezanuzo.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a073f153774---bimugabifezofo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f5b335f87---15211541737.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/25201318935.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ba78e5945---8752559974.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/50214698923.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/86155418405.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b37ebbf8c---papolowibow.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/setabusar.pdfIn PDF document text
    • http://ozari-ua.com/files/file/bupixudevumakaz.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/40593901912.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/17868ab8bccd127258a21a9848572890/25529566226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=2+year+old+started+blinking+a+lotPDF 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_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 10792 bytes
SHA-256: c042734d68998c4dd66829ee4d08d835c3dbf21ea2dee0528d901ac59bbecfb1
font_02_sfnt_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 17256 bytes
SHA-256: 06d30de7bb2955ff795b7667987f948b812ad5019efff64b1295dc89f3cf1229

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