Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12990ec459a84ac…

MALICIOUS

PDF

68.4 KB Created: 2021-09-14 09:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1382ba714a14fdf236edd4490d458c9f SHA-1: ced1ec3419efb7428f13941dc46e4445ea796ae1 SHA-256: b12990ec459a84ac5fad3da89dd59e511732732ece6cd1fa4b5024f9fc689eb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=merge+photos+android PDF link annotation
    • http://slesnick.net/userfiles/files/90754705345.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/sikebuxu.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/fuxewuji.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/75769580105.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/wajujos.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/vovonufigujasuwugejesava.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/30666306128.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/lubumiwep.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/55572063324.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/35947569831.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149dc96f4e---55956120131.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/pakowuvutufujebuwopazitub.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210903_21ADA30D2AD32C61.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/lokatizatawa.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/tpgumbtt0qvr7c16i83ij9iskv/libegitawetu.pdfIn PDF document text
    • http://effekt-film.de/files/file/birejosafef.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/2646741906.pdfIn PDF document text
    • http://szhlfz.net/upload/xiguzigisanokutiwi.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/21204958976133bba6b50a0.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/io05b9p5jjg52sc75j0ou2m4o9/90678807965.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/vojujifumiwupabesikubex.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/sibaletukusefuxaterires.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_off0000ae50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC662 15196 bytes
SHA-256: 2867d7101cf571e27692f4fa52dca37fa0d7b68193223a593c976cf7bbdc5878
font_02_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 10616 bytes
SHA-256: 16d849cb2d3bce94058a155cee136ea0558ad09aec30f71cc75ef70039cafbf7