Malicious PDF — malware analysis report

Static analysis result for SHA-256 5491ee3739136290…

MALICIOUS

PDF

95.3 KB Created: 2021-09-05 21:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9dedb27e3755a8078e80635d678101e SHA-1: c1fd2d153877684e4a6136ba8fddc63b8f919d22 SHA-256: 5491ee37391362906d0b01e2997fa95f3d9df179239631cd949822fea1f8f27e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://paidionresearch.com/userfiles/files/milozewimam.pdf In PDF document text
    • https://fwstc.in/userfiles/file/lifunegolixak.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115475fd8895---92487027826.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/o62bj5e5c4tdt3rrpv5g2m40pb/4408743672.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa5fb666d---55512130550.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f951ae8c1---77948844551.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f6f3e2636---jukeg.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7c1e6ff2348c3ee84591f4c98529ff0a/wokufugabagapifuj.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/91139610579.pdfIn PDF document text
    • http://medrea.ru/upload/files/birodegadugiwedoxozaro.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/90039631737.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/530814280f5afba697a13ad038b8aede/12163656072.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a32d70df4---82080112470.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099709b264be---99232805738.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/dasaxapow.pdfIn PDF document text
    • http://goref.ru/files/file/tabirituduteganudibud.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/2967950a3e0743c5874ee7873e6e8032/14023857632.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/tiwelul.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/60133171125.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/xamuxapelava.pdfIn PDF document text
    • http://goldmustang.com/files/files/rawafu.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/zimobuwugevije.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/67323538535.pdfIn PDF document text
    • http://chromatographvials.com/d/files/67696121621.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b95eb2e03f---38640984571.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2376eace9e---67611325790.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160feb73c452a6---90370420936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ahmedabad+city+bus+time+table+pdfPDF 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_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001231c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 10896 bytes
SHA-256: da0c1dcd9dd9bb242149a86b2c02607cdafc799d724ea371dc062d26cf1d0228
font_02_sfnt_off00013c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1E 19980 bytes
SHA-256: 7475c06275c574e66edd1edcb65bee3f7dbbfd319883edebbc094469c912dcef

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