Malicious PDF — malware analysis report

Static analysis result for SHA-256 5015a2be8e4b7c15…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 03:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7099e8bcf745c8915626da21c97bcd3b SHA-1: dd7a0cc52a26a85354874c981868027cdd217a9a SHA-256: 5015a2be8e4b7c15d14c3f12541e39c3bd940ed0595f7efce195f63d8d003b7d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users to malicious content. The presence of a callback lure heuristic suggests a phishing or scam attempt. ClamAV detection and ML classification further confirm its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pixomot.ru/uplcv?utm_term=commutative+law+of+addition+worksheet PDF link annotation
    • https://emprenderem.cl/files/62881894767.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c7fde7f23d868a9f2e15fac5731bb8c9/fogejituvapogibiwazop.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/fulerazodawovizejozadajex.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/h11h2uk813ko454dbvg6j8jpi6/tuzititugebatol.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/wugod.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9e37401c1---40259659052.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/42ceede5e80b5922f4d9ca07012729b8/49480644545.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/kokusuzugoginotexirow.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/guduxunu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608397c535450---65166792441.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd05ad60c1---52584884245.pdfIn PDF document text
    • http://sns.hu/_user/file/nazutak.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/24276267873.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/woganemi.pdfIn PDF document text
    • http://sns.hu/_user/file/75415114781.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/11469016060.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/mufinikezisofofowijebiw.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/27870354971.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/timefemumisifulipukiv.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac589cebc---sagisamukuwiwotajutudobo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160857d895b82d---mivafijafuvuru.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcf9c6e04d---59569649013.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_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 17792 bytes
SHA-256: 1d757dbeef3769033d306bd2e0f063e47ac3e10345c22c02d37c2530c6896629
font_01_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AA 10996 bytes
SHA-256: 963a39113f490e69d53cc5b70d021ffb0e8ecead0642002eac4501d1ae911a7e

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