Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3b893618e6bc3a…

MALICIOUS

PDF

96.4 KB Created: 2021-09-10 10:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7117b153a6b4088f039d00ed80633c77 SHA-1: afc7b9a8397e351ca38f1d614470cdcbbea675eb SHA-256: 8e3b893618e6bc3a0f48b0e91a5643b78fa28e329775d4ca5be046ff522324e3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://saigonradio.com/userfiles/file/piwewibawafizo.pdf In PDF document text
    • http://adria-ex.com/images/blog/file/4087132556.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/48292995888.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/tuwezikuduruzefugojim.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/nedepumagefav.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/99722686344.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/1904272817.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/74191724674.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ealn771h88re3jnke22c5b9ber/notamabim.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/13127630082.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d73a1ac24---tatof.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/setumekerof.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb1f7b9e2---36053047196.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356a6cc1d6b---pakepuvupifibuwu.pdfIn PDF document text
    • http://www.andreapondika.cz/file/35721545943.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/25351670600.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc7bd9e9e---lurupakuwidekubuku.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/28504481245.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/87112664249.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/deduporurulu.pdfIn PDF document text
    • https://italvaping.com/file/siwifusogiwo.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dibajenonoduvumitabusi.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/nuloviwudurevepigokam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=adjectives+starting+in+ePDF 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_off0001171d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 10556 bytes
SHA-256: e3aa31ed1a843a7dfd3a6d2023571cf4aa63308d3cc73512937a84222375a0c5
font_02_sfnt_off0001472c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472C 17432 bytes
SHA-256: 4cfad2260e6bee9688fd0226e91db874f49eb1e683a789be93f1a521abeaad36

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