Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cedd462a07c8242…

MALICIOUS

PDF

92.5 KB Created: 2021-06-28 03:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ecc80c394b625edec4000e76fb452f93 SHA-1: d3e209d6b369a840aef3b3e7a4cf7154f74e9d9a SHA-256: 0cedd462a07c824225103620534acec0092cd10ef8afc5e7c56cfcecb9fc8280
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=how+to+file+income+tax+return+itr+1+online+step+by+step+pdf PDF link annotation
    • https://divinenine.net/userfiles/file/silimujuwobile.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/75050359559.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/geu0k6ck8jel490iln60p6sckf/jixitasar.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/mq0lje42o0peeegldv8jll1p51/53346633937.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4c772c15554550706e175a1990e379f2/43191950968.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd9bf14628---pogutuzawikemima.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ee18e1e2c3621be6e88f341ec5802db4/pirovimavamutukigiw.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8f38bc0f3314a5ec45efdb4e4a92f861/wipezovewuduxajamiw.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5523ddef5c---53718305069.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/16755950163.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/38qvr1ndslnc9f3du5lljq8a97/40620850126.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/98538226311.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4afc82d677a7c799b4a8538aee346cb9/69873494563.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/xadivavawatagebukunon.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/dopudifajowelusorununol.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d24b108cd---37856996757.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706afaaee12---90605242543.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/80909403666.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2df15de0f599afbe66dcf55eea43158c/kagozubonem.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad4883f1c9---28350623804.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/86250538400.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/95970448821.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/7699906790.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/kusuxezakiwemizuwifazev.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_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 11364 bytes
SHA-256: 3f07fdf2afe32904d1419f52ca84d1d4fee4deb349f2125570eaf5583e6a0fc1
font_01_sfnt_off00011fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 16928 bytes
SHA-256: 11cec9e04584fc1c7d672a9722b8f186c52d8bfe36ca7e2776794d5ee277a86e
font_02_sfnt_off00014be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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