Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52853addc06695e…

MALICIOUS

PDF

69.7 KB Created: 2021-09-01 19:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4b32298ecf1014783d7d4ace3420ac4 SHA-1: 7d4cf1c1e3ab110ca7b6a0329c7885140b28d445 SHA-256: a52853addc06695e7a46fe73c77fa1a2f4cb9221267e55a2e6e77cff873f7ae8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to lead users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=meaning+of+facinate PDF link annotation
    • https://assignmentmart.com/ckfinder/userfiles/files/nebemeta.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/52851085923.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/laguv.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e518e812---633001209.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/55107560671.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ae1c4c3c150d4e2e0746536a847735fb/10739995263.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ade331287fd---fisuvirazijomunutus.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/19979072084.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073d75f37070---dipesiwimajojagoraxa.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/bfdb2a22c7487080fc4fd696ac1fdcab/14200603916.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b16b5423d---ratib.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/gilax.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/0afc99b936b90aa275468d9f8e3ee732/46598638237.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/17e9b7404103bd1ead11f841d4f2cb84/vitivuninoviwor.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/53197373ad0beaba13b5369ea33f7a9d/76350482988.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/gavaxipabidopudiwaweduwab.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b33bb3a7f4---74215618803.pdfIn PDF document text
    • http://hnspkjx.com/d/files/badop.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bb7baf84f---63847574834.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/91180740847.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/nibowatoselezubusaso.pdfIn PDF document text
    • http://ashioke.com/images/library/File/96482218967.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_off0000b28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28B 10192 bytes
SHA-256: 4bc6302853e6dcb5461655e9bac2f394dcfe62640df6f0111b1c75fa850070c6
font_01_sfnt_off0000c980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC980 15728 bytes
SHA-256: 46187c879b9fd06a4caad7392db7ed4b10899c10510d0f66b312d8b7c3033b50
font_02_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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