Malicious PDF — malware analysis report

Static analysis result for SHA-256 54bdc83d500803e2…

MALICIOUS

PDF

86.3 KB Created: 2021-07-14 05:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d99213b2ed3d0174e961be5fa9cff52 SHA-1: c2a5b3ad7ce8eb9c4c8a8183a3172c984ec995e6 SHA-256: 54bdc83d500803e284401f5259b0b690dcd6de5300b66fec35c8c893b8468abb
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to malicious content. ClamAV detection and ML classification confirm its malicious nature, specifically flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c2638a520277ca369f6e026da561ce57/69492979348.pdf In PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/72ac2f5ca5ba2d711f58b3f0eaeee09e/xomezojowozidule.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/53095201918.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/22096212081.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/v0d1i84p2a8e6ef9fhndbvg9j8/bidop.pdfIn PDF document text
    • http://snsi.jp/image/news_file/sejuzufakefavikipamidel.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mo8lps8mbafv46lb7h5vlitka5/zuxujomobaxisutajiwojopun.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0175f62e51d0d65ec3bb3b8d92e5940d/36922464891.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/8581597077.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/95473513094.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/83562130826.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608310050a028---31720153733.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/eb1f46dc3578489ee1f14277e08e84f0/moxiga.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/93ad209d5c87ff42bae75f39ca7a1126/sonesopozi.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210702080059.pdfIn PDF document text
    • https://aedwea.com/upload/foto/5263251456.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76a67f0ba---62400444555.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/wumetin.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p1937pag5lr3gkgcbq0brpgr50/21731423685.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/94766864949.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad985598d98---pafodafimakebazujumubako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+office+theme+song+piano+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_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 10884 bytes
SHA-256: 7cfa01468b926e170a88fe40f6c66da067a7320b74f5129d53a96df7e40b81e6
font_01_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 19136 bytes
SHA-256: 901056d4eb7d7344f3de476a531db5504042d029bdafc7a2966c5978c5c8e41c
font_02_sfnt_off000133d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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