Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5f645ccabe486a…

MALICIOUS

PDF

71.5 KB Created: 2021-09-05 11:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f3862fb9aeb63de20718fb23ebed44b1 SHA-1: 4d32911b5d9dba8903eaa00bf78da4a0b174cd67 SHA-256: ea5f645ccabe486a7246ec578e9951e9a9ef1155b9dc6820c7369be5887a4100
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable or compromised CMS upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16070385b24339---69981111771.pdf In PDF document text
    • https://hondaotohaiphong.vn/upload/files/xewajuwitewotojekenijom.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/vinuxovuzekox.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34804403198.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/zusuguwukiju.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/pazuzupu.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/26993100915.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/zuturajovod.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/95668345194.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/konorojosajodixilanuzijon.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/tuwazenaloniluku.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/repaputarivemuxapanifulan.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/29852676bca08a36da90e99a3debc2b7/vujaz.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/7ljh6c59f05bu5mca8odums486/60921045339.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/girewejedonokemukis.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/64490495842.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/251751a2c31d5244894ffe7107867ce9/xirigaropijokexaxafoguv.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/gunapefepoxebex.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160792294754e9---24054471407.pdfIn PDF document text
    • https://trexanh.net/upload/files/68821230353.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/bopirijitomad.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/55875887859.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/xadamataragawufeso.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/ninavifijazuxasozimenotak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=introduction+to+forensic+psychology+4th+edition+free+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_off0000b4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B1 10980 bytes
SHA-256: 0a6ec5d51540fd4fa4755253323a9813aaf1bb8dd0913449b6640d4438890415
font_01_sfnt_off0000cdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF6 16364 bytes
SHA-256: cc386771e6156b8fd4fc7b5717e953e908150705cf48aa7843e6aff155a0be99
font_02_sfnt_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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