Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee652507dece0b37…

MALICIOUS

PDF

87.8 KB Created: 2021-09-05 00:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca4e42ba7ddb983b417b9c179ba5f799 SHA-1: be8da0443acbc512c8625fa4c98a537105053cc6 SHA-256: ee652507dece0b374dc2e9b660c831e82c748d905eb21114beaaff1f1dcacb9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery through these links. The presence of embedded JavaScript suggests it may be used to further obfuscate the redirection or execute malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • 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.
  • 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 https://cructi.ru/uplcv?utm_term=saje+diffuser+manual PDF link annotation
    • https://livresdarts.com/ckfinder/userfiles/files/90907077230.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/mevadezud.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42de95abb3---zivogoja.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/woxopo.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1626433126.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/nb5ge5vl47dbekngoim15rmm85/vijaxonarusirav.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/jibumutabozapawubodopum.pdfIn PDF document text
    • http://kasargod.net/uploads/file/jizopu.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/lapevez.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210716_A24CF3BE91A59FAC.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/69745080955.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/or770c38s05oqh11ist95qopdp/pevezulawepupofiniluv.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/88setvjpnvng8pvggt3mnehs7f/47449865417.pdfIn PDF document text
    • https://ikansambel.com/contents//files/12836908950.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/35713241202.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c84b42570---23053591977.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/10436925319.pdfIn PDF document text
    • http://electric-kernbichler.at/sefimodakofopumopomifade.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/ropabefitidaputipudulij.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210628_1CC359BA52BE86A0.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/jibalaraxapavafim.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f865b1dfc9---pomiwibiwade.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ivtgf1f42kequamkrmt1ln03c6/10571508534.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607929109a1bd---wejujo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 10600 bytes
SHA-256: 917589753fe1dc57864d2444e34476e32bc3f84298f7fc8fae0b6bd6c9411439
font_01_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_02_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F84 18940 bytes
SHA-256: b68c58fb68f09797a3210d98047b200b3a9089d52a50e5f2bf20980e9ea0cb19

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