Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2452c772982640…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 21:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b73db9460fa82dee685fd82281474ab SHA-1: f42434d94a7dea7c154cfe05eaae4a34455af41d SHA-256: 0c2452c772982640af4467f0d69b7eeb9ff6b07d4fc29467b3838026359b637b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to obscure malicious destinations. ClamAV and ML classifiers flagged this PDF as malicious, specifically identifying it as a phishing or trojan variant. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8c52f1c3e12d8774b03acad197ad4781/turuwuzurisiwagu.pdf In PDF document text
    • http://sushi-belovo.ru/files/rakamafevudigizavipo.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e4e7ff45---bezibegagotobesapopuboba.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/1mlt4a7hpp890k0jo80495ou1q/9101647499.pdfIn PDF document text
    • http://belean.pl/userfiles/file/lemozenulawavoxi.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/gezemoratemuta.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/1b99274136f3ffcb3c87d3b3a183361a/liniwizo.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/wijaguzuturo.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/403c76369fbf2e30c609807870c71743/forizazinotaka.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/tizusolutoz.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/75679485197.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/8cfd29ebfa1fb614210ffaa81092e6b5/57948453880.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/9565374676.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/buzel.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160941e74e0503---bodofunujimugam.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/60608477056.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/90864054997.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/tilememonivide.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/284318ca9071682b9ee2abff428f9b14/52826166159.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///runajetolubesot.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/lesibovakat.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/3055910266.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/napovaneravile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dividing+polynomials+worksheet+grade+7PDF 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_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 11248 bytes
SHA-256: e8e86fc3049b15f793e6048d442d63917999abf65bfb4729384e80ff95252dbc
font_01_sfnt_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 18892 bytes
SHA-256: be313b1c3b0d777b05809c15713b575a2bbd698b5e8976fd0f6f37b4e29e685a