Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55d2e60db1463a2…

MALICIOUS

PDF

75.6 KB Created: 2021-06-27 00:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f56b871fce0aa469941fc468aae6be5a SHA-1: 5e35974633696fbdcdf042a2ce175bc369b41025 SHA-256: e55d2e60db1463a2cac3c38777cecacdc9a335e824ad51e36a73a20d7f82c189
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure strongly suggest it is part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://medvor.ru/uplcv?utm_term=protein+synthesis+pdf+ppt
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/61929285aff47816eb18c909ef01b5ca/35297344012.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090753c032f3---xuzebuxipizigixoludofa.pdf
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/kuwepoxutemonemuni.pdf
    • http://summithighschool1958.com/clients/71652/File/71872682275.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/g9d5kq5etd9a53upfj2eh3dq04/99293443530.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609436a4ec038---14066251613.pdf
    • https://uleiuri.ro/userfiles/file/nuzunovuxoserepija.pdf
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///202162616228880.pdf
    • https://ludifrance.fr/userfiles/file/14234882847.pdf
    • http://hurtmar.pl/Upload/file/xokinixapisigami.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be0f4d951e---24315500161.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e955696cc0e0fa519dcac13619e5f996/39146208497.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/utubbh3pjg2sc9l60rel70mrin/34443527489.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed2366e9c9---57208932823.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/su8d5l91577bslqed7mmgap350/80066181398.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c110dcb0d17---gadubodewiluregem.pdf
    • http://cn-junsheng.com/upload/file///20216108795164.pdf
    • http://asiavent.com/UserFiles/file///36501898118.pdf
    • http://majorpropertygroup.com/userfiles/files/25578452335.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb6eb1af3c---vudetadusififofepoga.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f95bd7ceb---pubuxiraxufem.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8vtv5ib9g0vcgcqtn29l38i2om/juzudalamulaxarabopaxefo.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/mudalozolovenuzuju.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/37150104602.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e47baa334---32410082275.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe7aaab738---63933932012.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/df0e0c0ddb4000c250c9a056e2dd3ba9/27747490046.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c891.bin
e4631e289a36251c9b8ffb4227efe714edac95c8ab2bbf9b1aca502be63a6a5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 10500 bytes
font_01_sfnt_off0000e060.bin
11860ac62c725485a2addaecf5d2395d1e146271e043ca8c586679fb2c38da35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 16048 bytes
font_02_sfnt_off00010922.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 16792 bytes

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