Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf46055897a838b…

MALICIOUS

PDF

83.1 KB Created: 2021-08-02 12:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00eff1f49d79198f91b48f00af0b3497 SHA-1: 8d8a0b97604190779d1566dce21c819c336007cb SHA-256: 0bf46055897a838bd4d5e673c4b65d53ce8bbaa7b17725171292d25763bd56c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.hermosabeachbungalows.com/userfiles/files/32633179699.pdf In PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083611bf15db---42390995592.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/logira.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/e4m1se9mh0fm7fmhaagd0nmsam/36249519152.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acce663cb08---47144617704.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/71748026864.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/begegavi.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073d327d1480---nenamolubulomuliwa.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aaf3ee807---45767768429.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864abd561ac---38734787457.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e688c59d07e206d2961d885662c43113/tojog.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/51256689098.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/98429759597.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb5b8b5b9---wubuxu.pdfIn PDF document text
    • http://07-3739589.com/CKEdit/upload/files/zosazawilovamaj.pdfIn PDF document text
    • http://mousike.it/img_ins/files/13039787942.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/80477403248.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/ec1e5a6f0ff73cecb2a7d759f452cee8/50325793323.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4619e66d46---manusugalejana.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/kadujenuketekibadutej.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/suvuwufebijitujajolotobe.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/16865861811.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/wuxomakamozebise.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de43f4538e4---65127011725.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/favivozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=filmywap+south+hindi+movies+2018PDF 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_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 16860 bytes
SHA-256: 13a6f773cc7b07fc11a9588fdfd02d1e3e91d690636b3550d788387760672896
font_01_sfnt_off00010a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12256 11400 bytes
SHA-256: 38385b85da1cc8de4727833e2a040217ae228382ee83284a6c1b854f29fc313d