Malicious PDF — malware analysis report

Static analysis result for SHA-256 28173fda557fbe35…

MALICIOUS

PDF

83.8 KB Created: 2021-08-21 04:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a17b13d669e3ff8fcdfa274268c599c SHA-1: 154d0e845c791145cb1e51502016253844bfadb1 SHA-256: 28173fda557fbe357b987365e2dc14d9892d43a0e855a4c9d7932767f5293944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further support the malicious nature of the file, likely used as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=battle+of+zombies+mod+apk+latest+version PDF link annotation
    • http://dtcguild.org/clients/80367/File/24365620224.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/bokejitifanesi.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/bifolakemoxexifipu.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/vebolowupefajesato.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/rikokafenisonipeg.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3725221115.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0757910ce9---sijuva.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/jegipu.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/kitopekiwebivelolobife.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/gikuninavatu.pdfIn PDF document text
    • https://angem.fr/userfiles/file/93481157160.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4e9c923a1d0eda1749c36f1a35ea5db6/68551057982.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/51850801640.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/vererilirav.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f3dd7a7a07177bc287f1cdc12c3bcbc0/17387018320.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-8/20210708000902968086.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/bea3197cf99811aa1cc95555499ffbdc/sevaluvirumewifubodo.pdfIn PDF document text
    • http://adveotec.com/img/file/sujilabavep.pdfIn PDF document text
    • https://cmf8.ir/data/file/fuxanozorulevisa.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/038bf55c15e2cf6cfadfbdf8926a3230/20653033578.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/zoxanokika.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/7mp2ncijg8iej5jce4ildf1g45/legarobazewinefejom.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/81bacddbae69ca39ce37d0226284ef81/sabofupedetirur.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161065776a4374---35261991694.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/85235490493.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_off0000e129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE129 11072 bytes
SHA-256: e0aba0225f35b952b239818f39cb2c125b3682fa372076cffa649b293e699b73
font_01_sfnt_off0000fac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 17180 bytes
SHA-256: a5525972b5c5bcfa812f9780e54eaa3c74586c554ba7fcc6bd59f60a0749a0e4
font_02_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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