Malicious PDF — malware analysis report

Static analysis result for SHA-256 735e3ef3f6d12715…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 07:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c60541dade0a9f5c667589dc8861bd1d SHA-1: 54d6f86bc2cd0a5acd79d2c14892be27060ebf09 SHA-256: 735e3ef3f6d127152b835e4d64dcd5134a90d739f7fdbeb2b5ddfa6d64c99626
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a7bd5bd52---tugesate.pdf In PDF document text
    • http://cathugo.de/res/wysiwyg/file/38166202279.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/bopuvofebima.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/41766115637.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/568984063.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f84866fd1c---mumetuwopaxopigotopiba.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/wagasuxalarokerug.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/viluwekur.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8fc1ae1d0---jusuzubobakowobifatifavu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/3ki6mf0a9qsnh01ntojj38jsi2/30321745989.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/50918348122.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a7ade085a---zekubivimibaxunu.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/10aea01803f240e9c3cb7a5522805965/93742857916.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/1543574636.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/pokiwasunuwok.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202107131133333169.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acf755890ff---wukideni.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/34618575352.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/48123544816.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/dewawan.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160708763e4213---55030628526.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/61226559818.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/62348093474.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/223aa98a98a4e340e989c35e9cd514ff/puvejuxerekebidinexawo.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/1145921464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=osburn+2200+insert+manualPDF 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_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 17968 bytes
SHA-256: 9c024d3f6fb4b3e10551cc5a40ec413771b3987d7ecd7ff3e35e6dc5d05d28ff
font_01_sfnt_off00010ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EE 10656 bytes
SHA-256: cb6f03f8c164729b293979888927024cccd4dc6ff8616444bff59de9ac95bd46

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