Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df1871657022620…

MALICIOUS

PDF

130.5 KB Created: 2021-07-31 07:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6849aa660e4254f7074d1a42dac03d99 SHA-1: a6fb0fc4baa6f219586c9508a1787271c2838ab3 SHA-256: 8df1871657022620220cf9abf613d7ab52a68ab75d4326ab512bc7eeff4d1169
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV heuristic strongly indicate malicious intent, classifying the PDF as a phishing trojan. The document functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.conectadoscomdeus.tv/arquivos/file/kawuponisogavowani.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada98310e67---bozexaburud.pdfIn PDF document text
    • http://morabia.fi/images/file/73586646396.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/nirarowifodilate.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/304a32644322fd63b7367a4eafd0f347/2053118775.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/16516271716.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/ropelupaxaje.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/43636644940.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff2974b4d5---zoref.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/95972284309.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/dp0n4r68l57vpp6q8ajg12bpk7/namuli.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bcc11b6bf---91504884784.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/5947589648.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/sugekiximusam.pdfIn PDF document text
    • http://revtechnik.cz/userfiles/file/34187560300.pdfIn PDF document text
    • http://screen.by/images/file/42367910111.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/p8i4m4qtjld7piv34v32gfvfmd/17910072149.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/384449a07770ebc499d5bfa09a42e332/39611391869.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef3ebc4e4f---liwotudujowipowibo.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/togukupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cuentos+grotescos+de+jose+rafael+pocaterra+pdfPDF 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_off00019426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19426 10964 bytes
SHA-256: 9d71a505b714cbbbd900f35c00424906b6d16474befda447c192faae3af1cef9
font_01_sfnt_off0001ada1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADA1 20348 bytes
SHA-256: f1353714f8c061fe1ccd00f0f5dc16b3c43172ca2cf44c47b170fe990eaf592e
font_02_sfnt_off0001e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1