Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4437bea92fefdbb…

MALICIOUS

PDF

98.2 KB Created: 2021-08-15 05:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fb815367e4bb60286828821010b50d93 SHA-1: 571f7670937922ba97d7005f80bb94f46ca8f62f SHA-256: d4437bea92fefdbbd81782bc0c60c6e87c2bb7157b609a3c9f2f24ca8de2fa63
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a lure for users to download further malicious content. The presence of multiple URLs, including those hosted on compromised sites, supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 7

  • 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.
  • 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.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed46e965f04---gulupepenaxopobu.pdf In PDF document text
    • http://maybaobidinhdinh.com/upload/files/14885752246.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105f084eef94---bexelijivaremogemajutu.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/g8v8hhlg6rejedkalvp7jl88a1/vejefobitoza.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/lexidebubuxiloso.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/zukomogagumoxivuridedone.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/wenobep.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/75968078511.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/viwibusitab.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89a9288cc---nolup.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/20962618240.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/75351014697.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/69936992044.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9e7ed324e---dokagakoduvigowudata.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/10224708710.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/vevubogitebitunotebotu.pdfIn PDF document text
    • https://33mobility.net/uploads/files/23806669399.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hlt5qfjuqa5gd4dtn5r99mbhg1/gopuz.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f11be0f50---gutimujo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16115d2c1b626d---sirunefokizole.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/20187143753.pdfIn PDF document text
    • http://vodnik48.ru/content/file/78402971260.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/relosesimugunawek.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/32347712844.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/16263501187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pakistani+cv+sample+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B55 17444 bytes
SHA-256: 8e9434c664ac1556a50a8706514d2d4a5abfca129aaf5b7502b967610d5c554e
font_02_sfnt_off000158c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158C0 1684 bytes
SHA-256: 72bda604c77ca771a1a14ee35dc8ff354b9f00ec81e947fe844e91f3a29209ee
font_03_sfnt_off000160c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C8 10720 bytes
SHA-256: 11e3774975f9f8db7bc0b40301af693ff36c8d5340a90b7770a0cf6dbf287f60

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