Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55014a842003b5b…

MALICIOUS

PDF

78.5 KB Created: 2021-08-26 21:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d2669f5f7d3009a5321872756911fbfd SHA-1: a9241b61b9d2e97678a6d52cd7a621d419100038 SHA-256: e55014a842003b5bee60f05064064aa7593cb9d2be22802c82a38af51fa1780c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://coretry.ru/uplcv?utm_term=child+protection+questions+and+answers PDF link annotation
    • http://passaicvalleyclassof1957.com/clients/44362/File/goluvuvarogusobupolalujom.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16113a1a669aa7---54818106987.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/9d1ef2a82f70e6b06ad6cd025e140739/24516116836.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/29669043274.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/937cb89c419ec3383ae57f45ea6c8365/diwunulof.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9f6310f62---vapiveregixonovawojisi.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/38535267492.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/morisajewawug.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/pofapotugupawezemigasetoz.pdfIn PDF document text
    • https://roc.mn/uploads/files/10807582320.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/bonawixojiv.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/49169894169.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/11009810138.pdfIn PDF document text
    • https://eklyps.net/images/file/21933495647.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/67882801757.pdfIn PDF document text
    • https://marijina-romarska-pot.si/userfiles/file/69701215854.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/46368435182.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/xosusitibuwabukevarej.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210705_194532.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d234ab27e8b2a79c5eb8681125667e90/7525193437.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216292054207260.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/55019880331.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210706_195556.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076588f25adf---gugibegugu.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/2411754478.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_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 10972 bytes
SHA-256: c0a160063e0bc1c2a6930e5443460ccf4678f295c740223646bf1a160c95f821
font_01_sfnt_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 15356 bytes
SHA-256: e5128fb80faf5b2367705ca999c8b077a27f931116578bee852b182e48c45ab2
font_02_sfnt_off0001136a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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