Malicious PDF — malware analysis report

Static analysis result for SHA-256 49862998b0095592…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 14:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e459a21a2c07eb60a220a5527607f015 SHA-1: c87524c65ddfd6e2ec2b0f22d3949308a57ac51c SHA-256: 49862998b0095592ec3702ba03e553ef41d005872945b6fc7ba1193e654a95c8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://andreuma.madteam.net/ckfinder/userfiles/files/49804940634.pdf In PDF document text
    • http://local-minicab.com/survey/userfiles/files/lujogerevululofowak.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/58630040871.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/24775140734.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/lopirujuba.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/63605832136.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/zugazupi.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec63f8e635---jojamamepasasodurar.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4c31edd42dca6a179f04f88d6d228502/71643373407.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/97967326001.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/94029248496.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/94290996116.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/72767302461.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/gozasemowari.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/tojotokalodisu.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/11027198944.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/rurobelij.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210905230554.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/tosokijokevisitegenim.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388a3f9f6a4---78904071268.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/mujezojejakin.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/70124902721.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310b96c270f---mudaxorebenotiro.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/fubililimuxodolomamifel.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/71989990379.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355e62de758---gojuzerak.pdfIn PDF document text
    • http://dsraxys.com/uploads/pojujuzopuribazegopubewug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=magnetic+strength+formulaPDF 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_off0000d365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD365 18420 bytes
SHA-256: e2426068c695a5f57e512e6c64e272658d2e925167d69d02788978a71c80f406
font_01_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 10876 bytes
SHA-256: 661c299fd51ad8c0ffce14099f425d41b4d5a81002956eeb1a0f9fbae2e9c86b
font_02_sfnt_off00011c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1