Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab30a1ca4b78581…

MALICIOUS

PDF

90.6 KB Created: 2021-09-17 09:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b5c148527374a987e8e30b170eb9189b SHA-1: 3550ac7cb53306a0637897e2bc09095848b73933 SHA-256: 7ab30a1ca4b7858141417921cd64a55554133cd17b0e32fe7fa52ef71b25c0f4
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.tristar-technology.com/ckfinder/userfiles/files/kegijutonobizul.pdf In PDF document text
    • http://karpzbeldowa.pl/uploads/userfiles/files/benomotofenuvidijuruf.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/jugitefagu.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/tizorofo.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/39963255590.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210916235723.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138c07c927ed---telikugofupo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/56163356616.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/zoninenekupavus.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/fixivipalufajut.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6c7ce7f4---37897060266.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/56664670518.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/58388054632.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/jofalobu.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/83919425306.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/suvopebowid.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143cd6659e17---9432942874.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/domoze.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jebixaf.pdfIn PDF document text
    • http://mobilenmr.com/files/files/95604277216.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c8ba75bd7f01d9dd548ee8824d90d5a9/joletotomoka.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/22649891236.pdfIn PDF document text
    • https://eetravel.net/file/53328451556.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/000e70c4a4767361d1205931285f3a2a/givupekotulibofufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=streaming+film+a+quiet+place+2018PDF 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_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001131d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131D 11356 bytes
SHA-256: d655757c66f076fc30c93b3ebc7765d508b30aa151f873f72831fb262134c0aa
font_02_sfnt_off00012d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9F 18272 bytes
SHA-256: 816bf13097272b5320cfbacf931d1b813fea54ee7af1164f95053d36914b357f

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