Malicious PDF — malware analysis report

Static analysis result for SHA-256 8329092eb1177128…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 13:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fced864b6daf1f83cf2223d0e89b4dd5 SHA-1: 92d06b7f6824b7f83d388389107dfc2e5a43647e SHA-256: 8329092eb117712855328535523e11f01fa52b94daf36035485c791926a0676e
104 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm or SEO spamming operation. The presence of a 'download button' heuristic further supports the idea that the document is designed to lure users into clicking links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.impactit.in/ckfinder/userfiles/files/lazatapedilebojodobufob.pdf In PDF document text
    • https://santechnikosdarbai.lt/images/files/5042150459.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/27408829913.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/xetinajixisusu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d5b92a31e46a4f359ecdc993a4b189c/borakizupomesexes.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/6861623797.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d219c9690---fufudugenekasanuw.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d22ed0235d---15909681001.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/6ghvrjle5ttqdk7s5ujtf9msah/xeniruzubadukodutokufovu.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/lekakibolupe.pdfIn PDF document text
    • https://sinarwaja.com/account/files/mawozer.pdfIn PDF document text
    • http://wmhsclassof1977.com/clients/34196/File/kurotuxobitofes.pdfIn PDF document text
    • https://dcimx.com/files/16101287344.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/24808399984.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/sumuxedefuxekujugirixaf.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/zovuximotuwovagek.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/099499210c8868805092ee34a1ae9e8e/dimexewameliravigotegobom.pdfIn PDF document text
    • http://aplus.to/userfiles/file/xukajusipebaromutijajug.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/k1pm76innpr96vh3g4871ep2ls/matut.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/103626d2d6b9759287cb865ea9ce9ba4/ratizukaruligigoru.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/dezobubilebofi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cd2347736---99020274432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=neet+previous+year+question+paper+2017+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_off0000d371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD371 17444 bytes
SHA-256: caee0d1fcd6e66583535bb5c51887267c7792fe8a35694eed5a294094b0eec1d
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001188e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188E 11192 bytes
SHA-256: 3be1ef8da468b882d39ec62b40d839a86d378dbc4746d521e3c9bf8569cd29fd

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