Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eaa57bcbd91d42b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 15:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46b26e266dc5b0c239997f8851e497db SHA-1: 55581d9b5be12adaeb4ee4839d5cfe68ffbdece4 SHA-256: 2eaa57bcbd91d42b4d744238c5465906e676afac861bbe270ec6fd8dd39aa0ab
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://optikametuje.cz/userfiles/file/38764352662.pdf In PDF document text
    • http://zkqzl.com/uploadfile/file///2021090522142872.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/faseju.pdfIn PDF document text
    • https://harmony.im/userfiles/file/wetiludaletixadibuto.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/80878981210.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/givurevumexudaxagegil.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/77165744196.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/20100527205.pdfIn PDF document text
    • http://compsult.net/userfiles/file/68508705286.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-6/20210906032446423820.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/28213575800.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/kametiwupurudo.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/gosogurejebivililurokifa.pdfIn PDF document text
    • https://ebooksweb.net/files/file/bumafawamosawifeji.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133475a8cf20---91513343476.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/69947868151.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210917_7C91CE575B1C2ED3.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/favisuvum.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d27ca2b26d---xudovowitoze.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/20091414937.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fffa02cd1---93407981757.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/17602780922.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/99011152657.pdfIn PDF document text
    • http://land89.com/ckupload/files/kesekej.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/25687209071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dawn+octavia+butler+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_off0000db5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 17624 bytes
SHA-256: cf989b3d6894e057716726a27253121bd19d6f9d5b2fde517437cfaae7bfa35e
font_01_sfnt_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 10836 bytes
SHA-256: 46578f6f46932bc4e533e83ab37b25f454ffd611a145ab52768b26f17cd51397
font_02_sfnt_off00012280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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