Malicious PDF — malware analysis report

Static analysis result for SHA-256 a189be0bdb5560e0…

MALICIOUS

PDF

71.9 KB Created: 2021-06-29 03:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90e11cd6a909d35c943b985a653f72fd SHA-1: 45f8b2603ca93e1ca25feee121ff496e9981ed31 SHA-256: a189be0bdb5560e06621106586aefa908f8bac5362c201db11ac4c928ae19ff2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=right+angled+triangle+pqr+is+to+be+constructed PDF link annotation
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/l8nfef4l5tj760dahup7joli4o/18564566627.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216184092577.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ec2c6e75c9b3ea2c8cc7567c0c182cf6/simexalomudejopugito.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ol4pukuev5ifalhp9ml44fs791/50759097832.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607bad6b3aea0---57359797848.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/069f71b5ec3c3ebf90acd82aeb3f3c25/tefuzezaximogajoxapovun.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/4eb629ee933763841c30fbb571a59204/laduxefelodanunuramunexu.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/60970433653.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/fofilutaxox.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/bfdda7ca1ecc7b2dfb84251713689a88/48852077239.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/uhfp8kq3m29qljptviuj970ehr/82027359541.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/gaxagen.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/57135709390.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/15530203626.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6f8e08a9---lezejejujubabezudatesem.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/gipaxewifivosi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076190a1363f---fepanaxelomedusezof.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/291358599165.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a16eb79aac6---pizavuxuwabavijutezoga.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609df618ceeab---24328195295.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ru7c2fkthe3hs80an6imnlu3ek/jaxosixegulapi.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/zivipowuponove.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/tikokogo.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/bc5dbee93b6bc85350a27ea6ccd0a62e/28547624739.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/dca44ebcf6d334044a38fc3df6b06e02/39056933786.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_off0000b86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86C 15508 bytes
SHA-256: 3ffc8a0f57c6701b91b0a3492f4dfa838f4b4a33ff2af2f80ac3b8d574808967
font_01_sfnt_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 11224 bytes
SHA-256: f928493c2ada49c12df3fa26524f753a5f271846a507bb56da300f44d2d4a1af
font_02_sfnt_off0000f9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1