Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a70311fd236217…

MALICIOUS

PDF

75.1 KB Created: 2021-07-21 13:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 77dd968769913427730600d7f5232161 SHA-1: adc1adbc2c6e1325e83478c5e2069ee46c62b178 SHA-256: 53a70311fd23621761bfac24b0c77916c9bac118b762ef4bbebd59f403e81464
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various compromised or disposable hosting sites. The critical 'SE_SECRET_RECOVERY_LURE' heuristic confirms the document's intent is to trick users into revealing sensitive recovery information, such as private keys or backup codes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://ahcxdq.com/uploads/file/211030417288.pdf In PDF document text
    • http://proxima-design.cz/files/file/50680758262.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f601c95a0aa5e8b14c457038123c91de/89565132621.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf87b57a9---99278381731.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/47123684757.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/somejazapiju.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/bdfced6de1fff7c544273b04c2d638f8/205526643.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/69146317374.pdfIn PDF document text
    • http://dgjst.com/upfile/file/xomifosanutekupepumuza.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/65639163449.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a12bd199b16---6450603669.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/4202355439.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mqtd3sa6je25vsi8tdua801rns/86501948272.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/45351164409.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/47199701727.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834fa4ee727---74897680176.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/39254795440.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f9ad0c0e308182a60a73d8e32bc97d6a/tonalof.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2b8e70784b6c84dd7fe8426121317f1f/90855754694.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/varisepeweneb.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/h1rnd0gfbr5c3f92gbu3pceeh2/bulufonapolisip.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/87576933417.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/xujexufuk.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/03gvp0t5bu5uj6jtm7cnbi0d84/benolonadadojefokuzur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=authentication+for+t6mPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC285 17088 bytes
SHA-256: 8a41fb77ae3d2db3991ca205f6d502dd07b5ad152fdc848f72ab600f10603158
font_01_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 10636 bytes
SHA-256: e64f70b1ffd7a6b79e89f7c9ebd96e96afa643709b1b7bd4abea42fb516800e5
font_02_sfnt_off00010777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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