Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00e2a514a38a76b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 16:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5708e79fd3e48f6c4f5b2cc230139eb9 SHA-1: 6b84340c4f8654847de67fd4a73f9941b7788241 SHA-256: f00e2a514a38a76b2bb63a504bb01df41ff4ccc1f2132562aaff116a2db28e3b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this, suggesting an attempt to lure users to external sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ist-lb1.istanajp.com/contents/files/67848984773.pdf In PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/mulujopewutakefoz.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/56687320921.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144146d9f117---62120293896.pdfIn PDF document text
    • https://emenu.hu/editor_up/saraturu.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109022015599525.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210908_4FD0BA4FE5A4B3E0.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109171138245011.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/dugujufuwozanageto.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/xajapufizabejewolefet.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161451dd833aee---fufudadofub.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/xejuzerubafokinuv.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/88912502195.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/kagizoniko.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/9522332003.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/lexigazafukone.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/mamosazebenasomajegut.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/zakusatisokubunasube.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0db0a06ba---fewumer.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/biwojoxebipa.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/42059957947.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/fubewenixin.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/wafenilawe.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136697227489---44301478595.pdfIn PDF document text
    • http://winso.tw/userfiles/file/32752346899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=homescapes+cheat+apkPDF 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_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 10380 bytes
SHA-256: c84624edf71a9206f90501c1201a21328f585a0e8e3e28ec80e01c372459086f
font_02_sfnt_off0001162f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 18532 bytes
SHA-256: 64ea3ed0bbb225435ca4179619562c484b34ff247143676f57b054a6da36484b

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