Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bb219227cdedaf…

MALICIOUS

PDF

75.5 KB Created: 2021-08-30 04:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 369ca5d35707593b639857ba94bdc0ad SHA-1: 7f2a88c4b69ff8c5a7ff7bda0cb5f290aa60d8cd SHA-256: 90bb219227cdedaf31a7cb5706235a5d4e25f985e8fcf09a483a0485e4cedf15
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://reclamesticker.nl/images/uploads/file/ In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075acfee45d3---lofivopifopudofitirexu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67267a25f---vizuvabixuwugifexavuniro.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/sozofibeladimog.pdfIn PDF document text
    • https://bloomeng.com/uploads/tifidomekemomebik.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/118dc61bf902c3e794ac316f86d8b741/joxegizozeb.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/kemaxunuzux.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/bc434ca4e6212895307ac2eb86d0a3ca/vexutibewezarulax.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/kd6jdfagt72ruooanmo3ilme9s/49515861784.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d72d5de9fc8be80307266bfc15e53aeb/selojexegumajasado.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/25899108569.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ad27ebca19510f6e32cfe6e8d7010f19/25121551886.pdfIn PDF document text
    • http://fitviewer.biz/files/file/titusidadowu.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/5166054836.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/buset.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/82175240405.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/22188883871.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/tazatonik.pdfIn PDF document text
    • https://polandpools.com/contents//files/61435454707.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/62688435408.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/706a33953b54194abdfeac522fa34d49/zudogamokolemodijejomupij.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/29087376257.pdfIn PDF document text
    • http://insei.eu/userfiles/files/nezidazikeva.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/94070382661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=school+district+of+indian+river+countyPDF 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_off0000c40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 10928 bytes
SHA-256: 608910d8019ee3b02ca0452c12eca4b7f5ad9253b6f6a7f66012ff044dd484c7
font_02_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 16552 bytes
SHA-256: 76ecaf166a4518197b19b033a1f7d03e05bfd9b27cf6d2160dbce1b230181451

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