Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4c5e235865246c…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 02:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 24a23ca690bbbf5143ec73f73d3d7fd5 SHA-1: 537a0b5ec40be2f70f8288585aa8cd8209da0297 SHA-256: fb4c5e235865246c2693329abf7a6d748dc1c160aeb1d2ece995716160abf500
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of these links and the detection signatures suggest an attempt to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://carpenterstouchnj.supremeroi.com/FCKeditor/file/xogosorozerumemekiruvun.pdf In PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161329c7327c69---9019534660.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/52666067908.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c49af9991c---21109366204.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/pimawesixifu.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/vetavobosovex.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/nudodigoxidirej.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/jugopivizovibarog.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/85517992270.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/1605318029.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16133de73b65ab---1674387946.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/73340256913.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/kenazikulevabebu.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/59526298223.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/65915189044.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/1490930186.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f77d1ce8575711ac16c815201ad84042/sojof.pdfIn PDF document text
    • http://lovesenergy.nl/file/14064975496.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/pisejefebedofovojurikixa.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/febirepob.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/45980365792.pdfIn PDF document text
    • http://seamacros.com/upload/file/17753296929.pdfIn PDF document text
    • https://paradigma.bg/uf/file/43535445671.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/10437756754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sonic+the+hedgehog+2+android+cheatsPDF 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_off0000b0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E5 10800 bytes
SHA-256: baa7351115da6dff29891146fe77bb045ec11158ed8b61ddb2d7d7a9d661535a
font_01_sfnt_off0000c992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC992 15940 bytes
SHA-256: 101e202a3bcafe6279ecb652f1bcfd0a9d13f6979faffdd8a77ac8c3ac2fa6af
font_02_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1