Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2460ce4bb7167b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 10:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb8f7a7f0728aba818f03ecd446d9ec1 SHA-1: 268690738af6fe558012c1bdef772aeb404cc40e SHA-256: fd2460ce4bb7167b774fd9d0a1eb0e5b3b0448d8e170bc536291cce14f52d1f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

The file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, designed to redirect users. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://parmalab.it/userfiles/files/pibelotivubipexepusazu.pdf In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/rggdsnmgd3rkvf28ucv90i14k4/80524635949.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161154689c7bc7---lamusuwosibawilekuwugabid.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/gulugivifozuzi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/69546306575.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607996979189f---57287893874.pdfIn PDF document text
    • http://envigest.cz/upload/file/29528767807.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/53933525263.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/84059149217.pdfIn PDF document text
    • http://teplospectr.ru/images/files/8366517472.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/14155937396.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/jotaxalipazawomapizafef.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/12911225811.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabd5c8c38---nuwukupela.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/kotakisefiwigogixidiz.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2699057d6a---nepasivatefo.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/rofijajobexutivujuro.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/malegoxiwiwigadexefuvoji.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906cf2e2d79---jetapoketenesagijawokelo.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/45235907689.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac734a20d5---lunizesinazilojuku.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/dexos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=electric+power+substation+engineering+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5bc9bc817e97d115f72ed02aaeb5eb5f/64003540.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_off0000d6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 17232 bytes
SHA-256: ff079f0b5700611819a4b6bbc9d0ef88eb8415b8625255e8bc20c22ebac8eed3
font_02_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 11104 bytes
SHA-256: f4ff27f25b095296e8ddb5a749bc74fb2809de8a0df19b371a233ece7d10beb7

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