Malicious PDF — malware analysis report

Static analysis result for SHA-256 11225424f28d1d61…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 03:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0fea238c4650b87b57cadde21516912 SHA-1: cac16df5205cdcfe0bbaf392492a2708053d516b SHA-256: 11225424f28d1d614efa276ba715945ed38cb5400ee3a234ae024c3c942ab838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://krisoc.ru/uplcv?utm_term=zack+snyder%27s+justice+league+duration PDF link annotation
    • http://kaies.cn/upfiles/210919055242707926suaol3.pdfIn PDF document text
    • http://jonme.net/ckupload/files/namugatuvifumojatakepesif.pdfIn PDF document text
    • http://qdjshg.com/files/file/90846446657.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/dexisizigi.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/jjsbmrki6pdap1jnrkn1blgc4o/wibog.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/nirumenovalutef.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210914_0B8C371428CE955D.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/bimoketudajovalasida.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/tuforuwopowigu.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/51491952363.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/p6suobaridthn5u1eq9698c9r2/17920435849.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/zifur.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/10233646948.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/24564031517.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/17107068276.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/potetironuboboz.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/5959755571.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/mitiju.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/bejobufaritajavunekovibuf.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210901060308.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd498c6ba---21046643086.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/sodusuboxovuwusedupil.pdfIn PDF document text
    • 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_off0000df2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 19756 bytes
SHA-256: 45d128c0a98982b3f97f33a260187db628988c09a2f741827aadea44290154b8
font_01_sfnt_off00011272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11272 10980 bytes
SHA-256: 05958b857ef7af4d88aaee756b17f967812c3fca86a417377a39fdd0b8e5ffae
font_02_sfnt_off00012bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1