Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad1754ed6586154…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 20:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8a5426f2ec033a62a445c35d0ce4149 SHA-1: ed0c2878b5ce81d084cc9cebc6801b4beb85494f SHA-256: dad1754ed65861543a3a9c4342c62239a99d5d562f550d07243483bc042ca8a2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS upload directories and disposable hosting. The document body is unreadable, but the structure and URL analysis suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://nazragame.com/calisma2/files/uploads/fotakiwa.pdf In PDF document text
    • https://aathichudi.org/userfiles/file/bidamevi.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/gabodo.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/50589292650.pdfIn PDF document text
    • http://vodnik48.ru/content/file/vakigugarodejudux.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/44081555982.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/935d6fa44d66dad6278fbe7e212e3de2/59400872557.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/a8244861edc134cb38717d5a0f38c36f/79583331301.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608d296134e3d---munurabudivalo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/o71a6p3jehfcncrhbn1qnvn1hc/jifexibatikifesaxexexuz.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d4b121387cc35c4b73814f3b3b144ea2/5586692595.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/sadanazogujovopupu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/basitoxe.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/41775925954.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073621b54bb0---95079089679.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/suwalodaxonalodijalaw.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160946d464cb89---2778905925.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/lifinubatijamis.pdfIn PDF document text
    • http://ranch.pl/files/file/25488212198.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/35935331228.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf4dfc9089---rexalaz.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160741e699f352---99552131777.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/1a65145b65d953ef015e30c5140fc7dd/59789153588.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611820422f353---16234984738.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/7755609389.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105111013.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/gafimuduzexizasorokir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=english+question+paper+for+class+11+pdfPDF 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_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 17904 bytes
SHA-256: 64218e6fb4c255c508214f1ecab0c2ecc1dfe18dc7ff9ae85fd76b9b8fba079d
font_01_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 11180 bytes
SHA-256: 6b01a8b65ae9463e8dacf286ecfe524edf3706c6c39d40f3940e51fb20fe52c3