Malicious PDF — malware analysis report

Static analysis result for SHA-256 7709c9293c78c9df…

MALICIOUS

PDF

92.0 KB Created: 2021-09-16 17:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9845fbfe195fb8edc0549dffee59029 SHA-1: 680e1059cf0d7ba65cbb1188d998bc188bc8e2db SHA-256: 7709c9293c78c9dfa72f76b9eb4dc63d2f31dd9a0fd9e3a25a221c3a763ba164
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://kyochonbuenapark.iorderfoods.com/uploads/files/60916473469.pdf In PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161320cc7b0a13---zamufiwixaredenuluna.pdfIn PDF document text
    • http://esprimagroup.com/userfiles/file/11788485926.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/39558340414.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/366f357de5e070b426c5c009a6e8c6e2/kokawamenewipagenezijok.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/gewuwuviwigofodapuna.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/tigodepi.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/85837942358.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///63261785234.pdfIn PDF document text
    • https://faceless.me/userfiles/files/jibib.pdfIn PDF document text
    • https://profesa.net/userFilesfile/jabituvetamigekofolegaw.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/muwowadotirawoz.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/60052144212.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/28236197422.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/46766741051.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/wezidasaxibogujo.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/rifusu.pdfIn PDF document text
    • http://jfe.hk/userfiles/2054023834.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/88903040757.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/13638227176.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/44869072805.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142c1be95cde---terepomadojufi.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090711573470554.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/22837844530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=information+technology+and+organizational+learning+3rd+edition+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_off0000fdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E3 18716 bytes
SHA-256: f484608de2719e996d27add56f074ce6c7fa9bae822beb7f88a9b4edeb2757e9
font_02_sfnt_off000147a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A3 11196 bytes
SHA-256: affb5dd28f2c3a9a0e81fdfd21ab7fa4ee0813c781efd3bb8f79da42086b48bf

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