Malicious PDF — malware analysis report

Static analysis result for SHA-256 5852d9265d214160…

MALICIOUS

PDF

91.5 KB Created: 2021-09-18 17:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1fa7360b12122b87902515eb5a2a5d7 SHA-1: 8090cebce4f05f28eb4a6ba9aac9df9d89276db1 SHA-256: 5852d9265d2141601f63f3bd6288ca4bc1df8674adc3b850e3f88a2f2341b475
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_URGENCY_LURE' heuristic also suggests a phishing pretext, although the specific content is unreadable due to the document body being heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=dragon+ball+super+comics+pdf PDF link annotation
    • http://free-note.kr/files/fckeditor/file/3206124256134fc675eec2.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/ruxetopenerejefonoral.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423ff588513---pilimulabijizuxutufuxo.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/begiputelifabogul.pdfIn PDF document text
    • https://sentralperdana.com/file/82233109328.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/benakefiwepadajivoraboves.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/wuxaxopubuxumulofadijik.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/77332168875.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d6124bdbfd794330426395abe4cfcc9b/zufipoporupuzobi.pdfIn PDF document text
    • http://elskenecologie.nl/files/27731355793.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/17827734013.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/jukiripobupa.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37027247931.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/ranoroze.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140cbf23cf1f---10228773577.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36118365153.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/2606668589.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/duzenemalulubimebave.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/jumofotisoronidabufopek.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/52837661566.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/55098615793.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c03c457c46---ponazoxuleti.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/38842559758.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_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 20800 bytes
SHA-256: 273a7e4fe809ece55b51ac19fd3b2e3a415ed73d1c3242334b2990c95d157554
font_02_sfnt_off000146ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EA 11104 bytes
SHA-256: 506414fae1e3bfadb52d0ef26fb67af5b86b6f9c462f6bfa156dc8a77df93ff3

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