Malicious PDF — malware analysis report

Static analysis result for SHA-256 d630977dac0cc812…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 02:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0418c6cb6c7bf349f71e017b5029722 SHA-1: 1e5036c7f51ff7be8a13afed8b955c88b18da5cc SHA-256: d630977dac0cc812c6405db94c1aeab219b532b4c6a17213b7f78876d591c9ec
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external websites, many of which appear to be hosted on compromised or disposable infrastructure, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=oliver+twist+abridged+version+pdf PDF link annotation
    • https://nvsrolko.org/ckfinder/userfiles/files/42642474128.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/20457226294.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/zobozuxaruwogefemaw.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/komale.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/sewit.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614277d5dda9f---58788233119.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/fc9a086ec63a9734191b49a2515321fc/semerapofanotodomavifemu.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/47920548493.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/76793893762.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///polafuxokovopikitu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/v2ng50qv4385pl34t5a187cpqj/99342235075.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b95d9d6e75---lanuvixasosefizo.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/sitijekopelogeno.pdfIn PDF document text
    • https://mahae.hu/files/files/pijaburolajusajega.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/22562032125.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/83597553932.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613499a8727fe---671587875.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/99757278428.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/juxubiwusarawiledujesip.pdfIn PDF document text
    • https://tipresentoio.it/images/file/92199348393.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2cd891446---sigisilodazavogoji.pdfIn PDF document text
    • https://flammerouge.ch/userfiles/files/wutixevupuzi.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_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 10988 bytes
SHA-256: 80cb7b6c7d68c0a9ec0c47143aaae70d82569c04ee21b5b3bda51239adb7ac7a
font_01_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 16736 bytes
SHA-256: 97377549840ad9310769e746277950bdc2feefdd19c8fd714f917c748f99ca12

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