Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b23f61985d021b9…

MALICIOUS

PDF

75.9 KB Created: 2021-09-09 18:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 59b659365a9f2be7d93e799257181149 SHA-1: 00b516eb535fc258c5a78707402833819927ee4e SHA-256: 1b23f61985d021b9a6d7544ffc5f86434db60d8b4639fadcea4877a4a716b662
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or are part of a link farm designed to manipulate search engine rankings. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or distribute further malware through these links. No scripts were extracted, but the structure and URL findings are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://giovanniseneca.eu/userfiles/files/82772685591.pdf In PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/31615765899.pdfIn PDF document text
    • http://shopabrang.com/images/files/68606301888.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382616e83f0---95771812167.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f92a8e55c---89491838284.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/85467309503.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/duvijedapunemedurovu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138c3ba9889b---42684881242.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/subaniteporaxalo.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/10022466868.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/toguzozujosiru.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/59213730576.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/kukufotijedawelelapuvazub.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131961d1ec68---katepujo.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/96002439672.pdfIn PDF document text
    • https://megashina24.ru/files/files/zazalemo.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/88031816312.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/39961773614.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/56232021066.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/35847119207.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/tutemogexawazoxozofe.pdfIn PDF document text
    • http://schubert-hh.de/image/file/30845124566.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e25005208f771916721f3802121a83f9/89868923841.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/20197573776.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/lubopefimataxewinibexada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=calculus+and+its+applications+10th+edition+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_off0000c2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F1 17512 bytes
SHA-256: 71d7cfe4307dafeb4e19281aa6eaf75e9f65b46a8b934df14f5760cb38720806
font_01_sfnt_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 10920 bytes
SHA-256: 47415adde274590500078b79e4021c54abee95ff0edeb4120ebf1739d772b77d