Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a12e17d319ce4d…

MALICIOUS

PDF

73.2 KB Created: 2021-09-03 09:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2bcecf3c509fc9387a972e54369e1c26 SHA-1: c1c668f10402351b9155c264f6d9e73a2d084d35 SHA-256: 60a12e17d319ce4dbf5b931ce815956522b46d73671f9012f5cbbcacf8d82de8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable domains. This suggests the document is part of a phishing or spam campaign, likely using the JavaScript to facilitate redirection or exploit vulnerabilities. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://ketchas.ru/uplcv?utm_term=increasing+decreasing+constant+worksheet PDF link annotation
    • http://kcde.kr/userfiles/file/jokitosegolefojem.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/lipapirerimirukimagaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf0580c73---wizaf.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcafc34699---pevunabojaxa.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/fimekifivedotuporam.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/kiruri.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/2756079374.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/gfkbqoeagrpqf7c09mro4jsr71/37469145182.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/jewajanuv.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d9c81f02---kesupiponemavibat.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/xinifumubexif.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/94166473977.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e689d22d---momukoj.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/dejibepiwi.pdfIn PDF document text
    • https://limmaginebistrot.com/file/kopujazekalesuwote.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/74849485525.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/15704926584.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3eb475743f5de67cee21b95a1b246a6e/winilikomezadap.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/bizirevawotijilevudopaj.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/satugozaxunavered.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/timijibelet.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/271fb92bf733db589aefa1dad13513d5/26357036955.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/88mrbstcc61hs0nqn8rfjsbkk0/logegofilida.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f2292fd6c---16345866924.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/42631a9e4ffdd0ef403882c0a1fa5693/vulakira.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4E 15796 bytes
SHA-256: ca4e2ff7a5dd393ec89a454e0368194c76714a8edf313fb9ca85233f8fca952e
font_01_sfnt_off0000e696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 10732 bytes
SHA-256: be784733ddbcd686a076042d07d56998062f5e87685574c0e1c85214706d80dc
font_02_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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