Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d5b3ce08a4c472…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 17:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 721bf521ded4cc7e1a3d8c8bab0eb811 SHA-1: f530134e43f26c047ca83bde4489ed9685221f26 SHA-256: 43d5b3ce08a4c47215e8a71e2ad839dbcff49876d77b7324e8dd87bb5c80f4b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://nomylo.ru/uplcv?utm_term=rectangle+surface+area+worksheets PDF link annotation
    • https://thebookonpersonaltransformation.com/FCKeditor/file/19996401985.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/tupaxewavuxapip.pdfIn PDF document text
    • http://orlickachata.cz/files/files/lumowurogupur.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/91372210994.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/nodaferote.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/40469234711.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78761eb69a---30688972557.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/cf143a05be72a4933210a11d6c814199/zatemolimeravi.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/wuzapos.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/doq3ls10hvl0aarklh4uloc7ha/18432924141.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/6f4361e5bb060490b0bf6eb75a3ac469/netafemujin.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611d9d6774be0---titexaripodilodoluvuzu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a1097d80f33cf39f35bfa07b23ea231e/sevuzofisunesomijupuwup.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8204d7f3---kidurodaw.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/taxekexibuletatepajiv.pdfIn PDF document text
    • https://fallsplat.se/file/xalapibuturafunixom.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/2735274423.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d5e95b265eed38cffb1a9cc91f5ba119/18900100490.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3320e1a9a---5003610791.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9keilauj02vg69akfs7c8p0b2v/rogarijavelodukurota.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/watigozugukeleju.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/gikifumamuwetugefaxo.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8b628ec9c93c0d395aaa1a3a9bfbff24/futepusisuxevovipinudi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d1bdf2cc80199a43cc12aadf55154072/pabotogazexibowamiliz.pdfIn PDF document text
    • 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_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 10848 bytes
SHA-256: d37d2596f090f92392c9fa326c1270a9f17138a7872239368e3d8575de6d27af
font_01_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF4 17792 bytes
SHA-256: f471965990c0705a484ac3ce3dca21b5e880b1a4c94b87a83a74c0a5a2064570

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