Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2c37795c6f5958…

MALICIOUS

PDF

84.6 KB Created: 2021-07-12 23:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc65a8640e25a506d058c4cdfceb1dfa SHA-1: d97a963ef984a409116ae943cfef063dd1151026 SHA-256: be2c37795c6f595819595efb7444c7e45aa807a79c2752656f0687839edbd073
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://zaun-produzent.de/userfiles/file/81087900247.pdf In PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8180de471ef3018b276fd42f069918fb/37665235251.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc21609e3---51530708265.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/wazeg.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160706621ab5e4---botapakijuvoxekoxa.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/83986753407.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/75346cc24a562abdeebd28a4debeef18/dowizutom.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874098686e5---makafenoromiwuxelanog.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/vsqc82miiv1dv1jdjq08e9d3u6/71996813268.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/28446722849.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6ae32cea8969e490bdcd22f9038f6485/93894814044.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/26035484809.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/mubijitoluzixisaz.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/majurimopidejofamirop.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/dedabazuxekubujamoguvux.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f15533b78bcfe6a54c99cb502beb4d2b/kisinexakobuvunilibag.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608460a1354ee---83892917324.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/37128677040.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608417295a741---wubakuxeduguluse.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078215d09489---79523467435.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2qtkid2dsv3jf9cv5mfv9edvvi/ruvog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+respond+to+desired+salaryPDF 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_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 17200 bytes
SHA-256: 69676295a7daa1f21c7b4e90289b5cc2a1882c163efb61a9858bae5e354a80b5
font_02_sfnt_off00012cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC8 10576 bytes
SHA-256: 0448c978bf079a561ba340500644b72ef0595f952792591ccc3b256bc6ae8837

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