Malicious PDF — malware analysis report

Static analysis result for SHA-256 41703326b78be9bb…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 04:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e05678d8d7ba150967bf4f6e251db093 SHA-1: 89af5ab02c2cae2c845c3265a4774cc7c9e9658f SHA-256: 41703326b78be9bb9f43eb78885c321988c42198539f1388c4f3d7f9e6a9ed4f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure itself serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dishandspoonproductions.com/ckfinder/userfiles/files/pirudoxipipetiduwuk.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160947fe9eaab6---luvoradidusanufewaz.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/dodejiwezuwapixaza.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/keliruxupip.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609488d32ab6b---66452310684.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/mapuzibalikoforo.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/39514625179.pdfIn PDF document text
    • https://europartner2.pl/uploads/99051223282.pdfIn PDF document text
    • http://sdes.in/uploads/pomolu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d5f4c86ccfa4b6424eb105fbc735d238/vivujotigenimazal.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078c448572a6---xetuvelatasuloxini.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/tebogixolowajig.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///raxebifulujukezemiwojega.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/tajijiba.pdfIn PDF document text
    • http://houselandia.ru/files/54521436652.pdfIn PDF document text
    • http://dalaichau.com/files/nilexivi.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/dabuwajeta.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc0a3c090---67562682931.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092626031262---kelasuje.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/nobamukodatozuwi.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/95382277224.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae71929458f---16171302648.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/78285554342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+put+a+pdf+into+indesignPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 10704 bytes
SHA-256: c5b2aa0ccb58ae92f879fa2379274d917234fe09e161af1e13f8e2fc0b8e0f3d
font_02_sfnt_off0001048a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 18168 bytes
SHA-256: 642ee3088ee8a6e4b0175605e3b76339d2af6367cd5b358d02483459bc70423e

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