Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24a235d68e01ae4…

MALICIOUS

PDF

85.8 KB Created: 2021-07-20 11:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f8baad7a4a11404fcdf39e3a0bf6b0e7 SHA-1: 3a07ba5d7fcd296f2098a32698036c210e682a8d SHA-256: b24a235d68e01ae44d00f5a1445c54e946bb062444a5e08f0ee166c3fc36ff42
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDF files hosted on potentially compromised or disposable domains, indicating a link farm designed to distribute malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://alpanelektrik.com/depo/sayfaresim/file/vuwijomomidufinerifula.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b17e6dd725f---rowesudagexotavetati.pdfIn PDF document text
    • https://mytopics.it/uploads/file/numakod.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/muxakujobabimorazanozid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f193cf38a6---timip.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/luregivixuwekuxemeso.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/36468967583.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/rigurejurosikuwukupaf.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/62357412145.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/67028375203.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e440fdcd5c---89206698130.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/werabonu.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/jhim01dm8v3sq8vl489ltjch2l/20446903936.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073625e46a22---28186352376.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffd2d2d9a7---45476711700.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/32493243696.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/45946964553.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a5acb1b95---zotosejujelofipoxipa.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/282bf8d585f58709b7cbb6af29735c11/pamafilijunolumavajigof.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/kugopavazegozigofi.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/mowubodemopa.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/smle0tljtsb9s62gt4sb3epg3c/sidusifolid.pdfIn PDF document text
    • http://imaginove.eu/data/Files/gejinopurelaxav.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/17954e691f49942fdc0377e05aa6f9e9/38103637900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=design+guide+28+stability+design+of+steel+buildings+pdfPDF 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_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 17872 bytes
SHA-256: ba210c80a65489aac4a50447a5da1039f8b3569d69b3662bcd9aa49b29dac5a7
font_01_sfnt_off0001171f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 11256 bytes
SHA-256: 0067e1848a4d8d75018dc06dfba75d59f820bac0c76ce6e348cf2494af5cb2e4
font_02_sfnt_off0001315d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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