Malicious PDF — malware analysis report

Static analysis result for SHA-256 577ba682db362ba2…

MALICIOUS

PDF

76.9 KB Created: 2021-10-06 14:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b78fdccbdec63eed436a39f01e289cb3 SHA-1: b13ebe7a3f6eee8c48d723dbadd1a508e751b425 SHA-256: 577ba682db362ba29ff8ec4f411e3ceb70f4321f3dde0369f2049ef1cebdbca6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garage-ys.info/js/upload/files/2710804784.pdf In PDF document text
    • http://styrexon.cz/userfiles/file/41203744116.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/2548931447.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/35828179598.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5828ad0f0---tuwegakibozazizop.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/61559473865.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16153d9c1cca9d---sigepolujufolamewex.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/vifid.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/47995887803.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/41524236012.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/kuxuso.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/41986963776.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/19489960213.pdfIn PDF document text
    • https://maymac.info/userfiles/file/69578463296.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/6549594200.pdfIn PDF document text
    • https://healthresearchinstitute.net/userfiles/file/zegomogigumekope.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137623bc3b5f---kebuwapenalonu.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/51788348076.pdfIn PDF document text
    • http://videlec.be/ressource/file/21252366243.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/nakuwe.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/rugomivodotoxawuviti.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/29644292085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=holy+spirit+come+down+on+me+chordsPDF 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_off0000c5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 10808 bytes
SHA-256: 3d102d2a59e7d8a22e57293d9ad5bac5625768ad10439a0c1f4761d32e0b41cb
font_02_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 18376 bytes
SHA-256: 05c7302fbea6361f79df4faf4590c88f30e7d6bb7e488d94df705669ec9964b7