Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcf719e04761484…

MALICIOUS

PDF

88.6 KB Created: 2021-08-08 16:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fed2feb091c5e3b21c32452fbf566742 SHA-1: 4f5b537f92c17e56c06b2bd45f2b852ce43495dc SHA-256: ddcf719e047614849dc815947bb1b3c7ee1ea08ffce671fb0a55eb70967847c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to domains associated with compromised CMS uploads, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and link farm behavior align with techniques used to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mdbim.pl/ubezpiecz/obrazy/file/puxenasepenab.pdf In PDF document text
    • http://optykglowacki.pl/obrazki/files/ligaxoxuv.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/luxilawasiruxokaxubop.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/fubowituxofu.pdfIn PDF document text
    • https://tavio.ru/files/file/gikepituwofawedava.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/figot.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/76803602688.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/93737700113.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5b1df8a1b9d3858ef0d75aebf5685a02/80920022495.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210806122510.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2fdc57c80---70485192165.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e22556d659---sugepa.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/xikujus.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/33400332997.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/kunole.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/22850124682.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070775244744---goboromitomuzir.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/62edeb779ee643fa74a82a833ef7ecef/zeritavon.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c088aa45d62---madowek.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/bobubefiravasadixitotige.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076764fafe75---78611670797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=para+que+sirven+los+sistemas+de+informacion+en+saludPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d130e42e1cc11c92d6d868ad92af7f09/judowisetivuduxaxuxekumus.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_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 17216 bytes
SHA-256: 874688b57fbf1b4486b53b836124eb17ddc6116e1da9aae293ca416c3ebe0ba5
font_02_sfnt_off00013b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B18 10948 bytes
SHA-256: d461236b48598b8ec7eada92733598cbefc4510bf546e21aee9f558a312fb0a8

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