Malicious PDF — malware analysis report

Static analysis result for SHA-256 650e9590ffe41530…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 19:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0bb2ac7a9e331ae8d4cbf76f026e566c SHA-1: 7e7076ee6115dd783bd10e8e99247d8305c71583 SHA-256: 650e9590ffe4153049737509d4a0bedb6c212872b77e0b127229ab376a957795
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=documenti+del+concilio+vaticano+ii+pdf PDF link annotation
    • https://hashtag.school/userfiles/file/89547376398.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b17542d46f3---65962903456.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/9582213354.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/suxafurasuxuxizamuj.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/171317615.pdfIn PDF document text
    • http://askort.pl/Upload/file/75606104881.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b9d607b5d9103423c681c945871a9e06/43674979114.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210503074924710310821.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/45994547322.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/wefomavogivol.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/fb374451a3a8bca680364cc316983e71/25381158870.pdfIn PDF document text
    • http://htcable.cn/d/files/kivatowolufesevigiza.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ej51u82nomd8tku3p0kljdoj37/fipapubobekobefejiluxo.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/67d0593d8aad4a4f3d5b8dbedb603179/volovidelakaz.pdfIn PDF document text
    • http://ruihuitax.com/files/file/82510132610.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/pepevebez.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/37999428367.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/kivewulux.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/gedemizotewejon.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/8503123358.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/vuwituseti.pdfIn PDF document text
    • https://ivanamihic.com//files/34719590112.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aec71866c9---mewulusunid.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/fugisopidowulazi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f6fa12af93a---13755920130.pdfIn PDF document text
    • http://ggled-smot.com/ckupload/files/vabogepofolebe.pdfIn PDF document text
    • 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_off0000c376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 17244 bytes
SHA-256: 2fe72489bab92418f67e4aba171a08742fe4abb14222b9d5cc7cbf845ad15e8c
font_02_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 10680 bytes
SHA-256: 2fa54178ac7f2285941b477f9f829c3d0e3e54d4dad1c2536fbd4b6343183207

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