Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb8ecd8366c09b4…

MALICIOUS

PDF

114.1 KB Created: 2021-06-11 07:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a8c06bb15daefb45d2658bff2b8e868b SHA-1: 7280ed4d91d58936020513af7f1f34db9f5e7d5e SHA-256: 3fb8ecd8366c09b4d15eebdb79aff80affaf367da3a17aeab48788814163f9dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://drafthe.ru/uplcv?utm_term=how+to+get+ash+costume+pokemon+let%2527s+go PDF link annotation
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dcf98714b---47449894849.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/todawab.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960c991a220---70401548783.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/taa95k667le85qa7jtndgabp9e/rurevulenuvor.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/tcmcpl5hpqob3gqi2k0ui9466n/bazab.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/70357074420.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb4a1f2eeb---pubaje.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc21de6b28---57889195360.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608087d82cf79---robuxume.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/bb38ac03517029e8c7aa41ce084cda0a/4624749851.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/98891392701.pdfIn PDF document text
    • http://cga82.com/admin/File/50299790742.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/fabil.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8267eac45e---disakexilukoboti.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/nixewojapufizilumokoronat.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64a4e16ab7---xanofarowoxukidalibir.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16094697686df7---ladeturos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00014435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14435 11220 bytes
SHA-256: 6835f739b35bf05b45117e7d37b279730c992d41619ee93699cef484f64d39c4
font_01_sfnt_off0001699b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1699B 5400 bytes
SHA-256: 1cb4ab8a6b97e7c93e9cdf7dbe94d5cb3deba2177807a34197b8f8dac7788a59
font_02_sfnt_off00017bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF7 11800 bytes
SHA-256: 1ee68def16554457ce9b119d738f171d75a14cf01bbf167dffd6ee6fe9c15adc
font_03_sfnt_off0001a3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3CE 16132 bytes
SHA-256: 29a60492f44b39d68fa00197234d6df9a0cf581d74754725da64c153577ac146

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