Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3082b71e12c0f07…

MALICIOUS

PDF

89.7 KB Created: 2021-07-21 13:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 798a828960db44fac348055815771e64 SHA-1: 1d550147e9ae13254209cb1a2ca722692d6d332c SHA-256: b3082b71e12c0f07078ed9599fe93d22ab2cf660cfe3b663567ace5d7d0b92ac
112 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress upload directories, suggesting it's designed to trick users into downloading a second-stage payload. The ML classifier strongly indicates malicious intent, and the presence of a download button lure reinforces this. The primary attack vector appears to be a phishing attachment leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609183cce841f---41571125355.pdf In PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/rupizifuwixoteralen.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02f45d022---tubalapazugufatigogagovot.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609601a5785bf---kisokemigiw.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c776b74e---finoxuvevorolilazojo.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/sabazipar.pdfIn PDF document text
    • http://kfbi.ru/content/file/70430997895.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/13833680092.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/lunipag.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/9khp5ak70n4cc49va5iv870t65/90378382113.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e0d7b36cb73a38f50afc1ba57fbb8abe/49594392071.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/afb80737adf1f09646ae6c650d9405ac/1474168220.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/59487418907.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/58698544309.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/75441911320.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160747d501791c---majukonokomotalunerezuko.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/de57cafea12963a4a2fb28228666dce2/91802089985.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be7e5ebed44---92280884604.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/4gep6p4820a4q0qcljhdq6chr6/livoresojumij.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/p05qpm07u63rd2nj0k74te39lv/wibutojedasufarovegajoja.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/muxawavotub.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/wazuvebafarosonomutol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=free+pdf+to+word+file+conversionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000fb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AD 17380 bytes
SHA-256: a17351296a19a3b2191550c1cfe0c125afc36950004d9d96fc793778c0f5b9e4
font_03_sfnt_off00014115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14115 10580 bytes
SHA-256: 990889a2a54a79772d7af563bde03f6b5cf923d2ffb45fc0f1493932112fd723

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