Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a303c248093b690…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 08:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 753ea6408f39d9d8931e1698901a41e4 SHA-1: 8056c4e1f6d834fd59389cd5f62065dd14df8571 SHA-256: 1a303c248093b69051e60a6e98a4f779698f4139a4b0ee978042dc707ca5a5e7
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 0.9949

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 http://castrolmintabolt.hu/images/upload/file/bivad.pdf In PDF document text
    • https://12shio1.com/contents/files/80700749716.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/97289427301.pdfIn PDF document text
    • http://nprofit.hk/userfiles/nelesika.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b64eeaba9---94667329368.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/73242755775.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/keribubaxuvawizuzi.pdfIn PDF document text
    • https://hiroyoung.com/data/files/kesujuvupekafelumifudud.pdfIn PDF document text
    • https://semut73.com/contents/files/fopavelemodufepizoti.pdfIn PDF document text
    • http://www.siposferenc.hu/html/10233620287.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/60266462606.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3eebd9851b57593bfe994715f3526d39/65017871083.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce54d4ebe8---foteso.pdfIn PDF document text
    • http://svx.su/ffile/file/tibitazajewub.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/77351667153.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/dokafobawakov.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/sugumusurix.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ae2461370abd197170ddbe035a41b9c6/kodapopipuwukax.pdfIn PDF document text
    • http://lobi.md/userfiles/file/70800248043.pdfIn PDF document text
    • https://togeltop.net/contents/files/17999629733.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/8003188110.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fedbfa93c879072e2e902c5af97c0ae3/58842491963.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/58598826163.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/75248876075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+uk+forumPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 10084 bytes
SHA-256: 846bdeaac836677fdeac23a82b1cc82366ffdd4f10fdb80cc299e2d1dec97ef0
font_01_sfnt_off0000eccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 18768 bytes
SHA-256: 66b5a9bab3f049ca89d9ce3f48929c9f2db678b85591c4c7af7a33fe69d7210a
font_02_sfnt_off00011d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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