Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebff2358aa7ee0c5…

MALICIOUS

PDF

75.4 KB Created: 2021-06-28 14:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8793e5e1e93d9534f455dabeee53c98c SHA-1: b1c0dc4bcbbdfce176821fc59b3552e519901916 SHA-256: ebff2358aa7ee0c5c7866de35f6bb3a61f592e060884b49884ea0eac48b818de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains. This behavior is characteristic of a link farm used to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploitation or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://zlatartopalovic.rs//files/telubinusenewofavo.pdf In PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/bade813bad7e6157146f10d6165f1ee6/wifopoboba.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/08b00d8791ab3833a072933e5e20dd35/gurumatelexefosifabakuzin.pdfIn PDF document text
    • https://yuss.itfile/senuzegeximixo.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/pojefimul.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/25904016543.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b52978fa48---99145180647.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/024478ba889780f13ae5d96df7a38a27/60461240372.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/35802828290.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7cd0b63282---futadizezikag.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2f484a7358300d3dc59ec47bad6c677/63050015940.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/43917630689.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/nukuzumixop.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ikqi3hc549qj2d38166p0auh93/34203784566.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/jabosexox.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/gedklbak2p0jhvfc5tccdipfia/debawanepaxopomipuzeb.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/6122246191.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb65a7fcf1---jusewazijag.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/gibatabulu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d1295883---28699961424.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc2a034646---38765916343.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/nplgdfe9bnlu0epha441399683/285232584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sum+of+exponents+of+binomial+expansion+formulaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F0 15420 bytes
SHA-256: cb66841a9f91846146d3ea488c642c12bc78af87e4b785319aa782d2c6a59f93
font_02_sfnt_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 10936 bytes
SHA-256: 5910f6d1a52652879d0bf6b57076cf130020a88229f4e8d9a34ffa9a8cd5e869
font_03_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7

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