Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92348b334f7ce48…

MALICIOUS

PDF

88.5 KB Created: 2021-08-14 17:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 43e052a075f10adba0031af1379fb46d SHA-1: 56fd8e90ea6ec38b3d6ca5a3e5d30ce2a6177555 SHA-256: e92348b334f7ce4884454cdeeae8d447a18288c908fd56a3fd1c054d253d69ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF used for initial access.

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 https://sealskinz.ru/files/file/35770478263.pdf In PDF document text
    • http://sva-jeanroze.com/xmedia/file/93026605712.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/95d87349781408d7b73168385a341b14/75047034707.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766608e378c---vapax.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/57240800153.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210812101638.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/44249123086.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/74470683729.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mipujosotutekek.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2b432561---98164166589.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/68324910520.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/37279277259.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/25536402983.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/totudenepe.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/kidusuzufa.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/pokodidemejifi.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/28081263695.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/60331112630.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607278be35095---xifivopekefuxino.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/0a42e38186f0848f4e5fe0cd629310b5/sawesalewojosukazakima.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160868eac00f8c---nidetejameme.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/85766828697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=rom+j7+prime+g610m+android+9PDF 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_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 19768 bytes
SHA-256: 7050f23ba2af576526cd50e738ecde2eb228119ee072602b687e33c402053748
font_01_sfnt_off0001208c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208C 11156 bytes
SHA-256: 8d2f4205b2a168cf0415c2a487f975f3335305df863896d406aa3d62f921753e
font_02_sfnt_off00013a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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