Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab2b2579f80bbd0…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 10:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21e97a88650c4cbf9a9497f871662ba6 SHA-1: 40ede0cbf6c8605d2c2ba739db0119b06e6bc756 SHA-256: cab2b2579f80bbd0d5a2d78c60b6f83da7c6ff6d814371d676e53e1f5468045b
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with many URLs pointing to disposable hosting or compromised CMS upload directories. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://sushiloverca.com/uploads/files/13165529694.pdf In PDF document text
    • https://es21sys.com/userfiles/file/xifoxelafakagetabapilu.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/31521725820.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f926688d90---munimejudalezof.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/50121099845.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/banijumi.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/bexorisomekezejenigoripaj.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146a205977a7---newona.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/58031522396.pdfIn PDF document text
    • https://songhongresort.com/img/files/70830594878.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/24039751528.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/35925372314.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210904121808284.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/46024445140.pdfIn PDF document text
    • http://mayjack.com/upload/files/8673028262.pdfIn PDF document text
    • http://midospa.com/upload/files/35524055697.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/tajelajeravujiroxu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130815534d15---75979142641.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e63462b887b999922063973a880f28b0/64130984147.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/60845628354.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/73911333167.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/xavofe.pdfIn PDF document text
    • http://ifap.it/images/file/maxowewaberuluvibeseb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=connect+wii+remote+to+androidPDF 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_off0000b53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53F 15948 bytes
SHA-256: 57c3f2f010f6c2365344211a8f74d7e4e9831d82eb0ec44e6085774cb03fff0b
font_01_sfnt_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 10436 bytes
SHA-256: fcd10b7f4a19995c94007205275c44129562d846e9c550069270b2c2ee79c5bc
font_02_sfnt_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1