Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfcde1f52ad2843…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 16:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4eec3c914cfd0223a38db740c3728fc4 SHA-1: ccaed2afdc1a691df6033b4276dfe3674a027494 SHA-256: 8bfcde1f52ad284376ae4a64b6a4d5d3755f57c0a58d406d225f39bf47753089
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cadf8511c8f---40218587724.pdf In PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/8544466420.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c8574343b---41290525618.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b39666f1c---metevukejozefodukusumu.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/jopijosiwimur.pdfIn PDF document text
    • http://www.celso.org/download/6923998101.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ca6237a4e24766527afba8af134f3436/xogexuzedojukodaj.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/8n9iclbjatdnnvjg1mliqlg2d0/28176521686.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a9c80e3ffd8b2027a250e824d1da88e1/zapedimozodazomedebevalo.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/wajitiluguluxu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c96dc72bbe6---xajig.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/94700026017.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084edc51e0c3---xedefozenamitob.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d97bf8834a811e4e5e135372f60fda02/67681925932.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/726b84bbfd8e35c7515c79c44307f943/jojabakolipajimogokafog.pdfIn PDF document text
    • https://quaint-house.com/wilesatisegixasaraku.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/gafitepafani.pdfIn PDF document text
    • http://imaginove.eu/data/Files/85679330012.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/78460409327.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sagimegarami.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/padigovazizezov.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b244a99bfa7---xaniruw.pdfIn PDF document text
    • http://ruresept.ru/files/file/50072264371.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/6765420303.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/pejasivis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=recipe+book+pdf+free+downloadPDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/wavitafam.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_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 17608 bytes
SHA-256: 2753b0170cfcab7ce2f9e54643811c5e309bb6745a12cd371e92142f9fccfd63
font_01_sfnt_off00011388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11388 10708 bytes
SHA-256: 8b7e1deb684366408dc6bbd38dd829d0e379fdac2186d5aa92c347427930ca0c
font_02_sfnt_off00012c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1