Malicious PDF — malware analysis report

Static analysis result for SHA-256 42416d346e5e7223…

MALICIOUS

PDF

73.7 KB Created: 2021-09-01 06:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 159dcee0f00b6d3467ee429e27471869 SHA-1: 9be385801877f7327cd20680cd4bd248bd26c294 SHA-256: 42416d346e5e722349d492fb9e4b3ab5864db49ee58a07b1f6771b80bdd95cd7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users into downloading further malicious content or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e07882458---48286359601.pdf In PDF document text
    • http://curry-box-deluxe.de/userfiles/file/punovonixuwase.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/rg9fhnoe6qp8av1co9pm05hmk0/39451601520.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/707f484152de2c9810a1b5be3f634299/revozu.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/xadudupovaxijovejekemix.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/xemegedotipukadazozerive.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0418d8192---16109016997.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/zitesatufemujufifiga.pdfIn PDF document text
    • http://dentherapia.hu/files/file/xofapavuvenimani.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/776143707.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/89680464994.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/tezadipixu.pdfIn PDF document text
    • https://bloc-immo.com/images/65005617635.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad5b77f4dd---92185259363.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d47498bfbb---80107019816.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/rizogidukajunujolu.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210817142101.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/haupjtcjjo87lokj2vth73qo0k/31804789641.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/dojuvukinobowedapaguzan.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084bd12d4bd5---24416410792.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5815b8889e5f2cc3b773de110c647a0b/94860557993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=scantronic+500r+engineer+manualPDF 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_off0000bd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD54 16424 bytes
SHA-256: 84c7aa7bb91ff4d6d9163928943df69fd44e316e1ffd2a77fcf051fb817df21a
font_01_sfnt_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 10836 bytes
SHA-256: 78188d76d8a3cbc95d5e3e493856f4b7ece92b7be71ad04d8976be3c3db0ce2d
font_02_sfnt_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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