Malicious PDF — malware analysis report

Static analysis result for SHA-256 764c60ee5499d4b8…

MALICIOUS

PDF

88.0 KB Created: 2021-07-09 12:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4efa0e4c328caa376933512b8e2555d SHA-1: 8c6a41ee5e2b9ac995b546e5d04ed16d6ecb387c SHA-256: 764c60ee5499d4b8cb3d59b2fedb051c5f6ecc71b82236ef7bcb882eb38def49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd202789fbb---pakolebeme.pdf In PDF document text
    • http://lyjclinic.com/ckupload/files/7115783614.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/fojepanezoru.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5ae8957773a6e2b2e07fc3e973c7d8ba/wexipabejazudik.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/69200980458.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160863c557a0f4---bejolaxoviwuxoma.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/94946639201.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f5f1e4be0605844c7022ae246049bcd3/42110084485.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/leniviruxapusosefodavo.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f88bbccfc107e90c8d58a5837b65e079/58244524600.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607662ce626a1---17289540409.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/zujojepo.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/80670358744.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/3009d943a4a41e1fb46e475097712bdf/13329130412.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ee5ca9386---resudun.pdfIn PDF document text
    • http://remobudostol.pl/pliki/19452182940.pdfIn PDF document text
    • http://pinetreerealty.ca/clients/55933/File/5304012679.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/40695186989.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/74187827493.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/xowudiwotujulu.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077d2e00bcdc---kumadu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c3152e418860223ed36674894f1cd79c/pofodifogoxujafasikexo.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/36504900989.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/42257834620.pdfIn PDF document text
    • https://schmitz.cz/res/file/37834946052.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cb053aec2---9174683955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pay+it+forward+food+pantryPDF 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_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 10348 bytes
SHA-256: a8aa2a95caf647791aebbe0cc29a84bb3c039e7ea34a43c6e6fa3aad15c5eb1a
font_02_sfnt_off00012735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 16772 bytes
SHA-256: e96329c809dd495212537790d74f97551e8f594efb518130ebcae1414deffafe