Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48cec490a3595fe…

MALICIOUS

PDF

85.2 KB Created: 2021-08-18 20:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bca89166995999341a63dd84388466ae SHA-1: 3cc2b928e519961e971660e4926d6c92afa0acbe SHA-256: e48cec490a3595feb723e339de5f66a620c91c602d6a304d5fe697b180b89704
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised websites, identified by heuristics such as 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests the PDF itself is the payload, designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/d7n4sg72qjdh5rn5uh55t2tb5t/lataduxa.pdf In PDF document text
    • http://techscreening.com/userfiles/files/6387743451.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/98391912481.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/xodijepisageg.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfadf88e9f---kebatowilexotukosemo.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/rifafomag.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/11f87c6671127c9c0a8fa3e69ee80824/64570666238.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c03489694---18440713823.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48c1063dd1---jikefuvolaf.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/60080749914.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/74013575.pdfIn PDF document text
    • http://espokebar.com/uploads/files/68596722424.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/tulobujowugozel.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/744c6456da76980f1348c09dd8a599f2/gokogovedukatevatetux.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e73fef948---zivifebi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607145bf300a9---jafikiziwone.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/rasosadunesasi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611684dd0d3cc---lupukulim.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789acc71de4---86409462438.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/93828571842.pdfIn PDF document text
    • http://webursitet.org/Files/file/50305707865.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/92f862a791b0540958e3436be43cbd8b/banifitomitizuzusanuzufew.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/oqh879i96b1ts05g9sf7of0a08/950948293.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/f4rngtp137j6h7um5mlg1ui65i/46591826916.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e64b9ad3---64219057701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+cite+the+publication+manual+of+the+american+psychological+association+6th+editionPDF 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_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 11668 bytes
SHA-256: 5fe5506bcf44e26386eac49c5f40aec0fa8ba66bf8c618509ab1aa5bfac84803
font_01_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 17384 bytes
SHA-256: 3a58ca99ec901ffb39df3e6d5703708e9194add539f33adc00d2c4ef5c7e77ae
font_02_sfnt_off00012e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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