Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1625dc2fc19a3e4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 18:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e2eb01a71a0af8594729363bdcdffce7 SHA-1: 99e152c701980a648d4862ccbb3f18e8ea59fbd8 SHA-256: e1625dc2fc19a3e4868782ea97fd3c73b2f869ba1e992d88eeeb88a584c5641b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1eacf5c5921533cced61879ab0ec02f3/94744978675.pdf In PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d346949635---rugakupakute.pdfIn PDF document text
    • https://evabizz.com/userfiles/file/18553680163.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/94177083764.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/lidekazenopesisebupuliluj.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/18289312981.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t3eqdjt7q2lo5rikurnmc3fcv2/90513231376.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/aae4fc082d44308ab58b6c14f16c1f97/mopimafavora.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/39a097d04902c1d7eb9b6ac455c8ebfc.pdfIn PDF document text
    • http://aa-nusd.jp/resuvesuxupopex.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/17606635364.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/loxidolajifujewasix.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/xokawodesivozu.pdfIn PDF document text
    • https://superchills.com/userfiles/file/81648322956.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/gutupatudozojezutixuxo.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/81877109211.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/68189726415.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/58447246566.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/31901045397.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c0ca5cfc659dbf5d1ff1615cdd2cb22e/54846626052.pdfIn PDF document text
    • https://remini.hu/userfiles/file/25721269847.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/38898688983.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/nupesonozidanif.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mutitisuviwexodolazolisil.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1a9748c77---27463751737.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/bemogurepaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+record+telegram+callPDF 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_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 10428 bytes
SHA-256: 7a922dc087a09dbb2a6b1f595b3d98fcf7c0f141909505f76884ddd7158dc85c
font_01_sfnt_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 18604 bytes
SHA-256: 7963b1f8e61d7dec9e2089775e278942114aef710093f0ace4412137119ff970
font_02_sfnt_off00011fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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