Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68a57296c13cc6c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 05:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2ff7ed1ee8ae843fe0a2e746b31f29d SHA-1: 30b58bbdeddfbb20974ae858da9115f5f142b1be SHA-256: e68a57296c13cc6c8bbe8299c31bab564401d626ad1f6b56f04465ec1d47cd73
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristics indicate the presence of a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/79114144186.pdf In PDF document text
    • http://jgweld18.com/UploadFile/file/20210903021350456.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/98589510393.pdfIn PDF document text
    • https://dptech.vn/uploads/files/26573975959.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/29841231594.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/61154687524.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/75488202708.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/27050005719.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/lamow.pdfIn PDF document text
    • https://sanidom.pl/img/file/pasodamebabidajikaj.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/xapokejef.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/puxotanagukuwuwomukob.pdfIn PDF document text
    • http://babamoleskine.com/files/file/tusarefotufolikosefa.pdfIn PDF document text
    • http://dnepropress.net/files/file/punedukusuzirunuxuzu.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/71634341054.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef46c68bc8---luvatamalukusinirovaz.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a5b792694400f05c0f0da16b330a6ed2/91836687338.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/faa0194b0cb826669066e1134e63a5ab/59857737844.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/xezobebadorizer.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/5178233704.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/magetizelageresojobun.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/tenapim.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/26816401918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=command+and+conquer+generals+apk+for+androidPDF 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_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 17968 bytes
SHA-256: abd2ce1af5364fa901758135114ff217e1359c279938b195810555c407ca9f03
font_01_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 11236 bytes
SHA-256: b76427b169225dede4594e42eee5bc63822fafefdd8890598af19372731d7deb
font_02_sfnt_off000116da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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