Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7a6dfcaa5507a1…

MALICIOUS

PDF

97.7 KB Created: 2021-07-24 15:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a4aed9774dcddbe78bdbcc2beb1c91ba SHA-1: 66821221f5d05cd5a65252ee30bcbcf5bee111c8 SHA-256: ae7a6dfcaa5507a1c03f8d92663e47a33d4019dac9fa068ba8e7469ab2f8b5a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://jaurrieta.net/USERFILES_JAURRIETA/files/dexipasejufawu.pdf In PDF document text
    • http://mobilesamara.com/img/files/file/mafiromasibaravorejosumu.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/mabegitijeromum.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wosuparuzizajenud.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/24265523327.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/vakiwozujevi.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/46378137018.pdfIn PDF document text
    • http://lawngo.net/fckfiles/41335936623.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/8k43jqdmjefsjjiv337517j792/sujuxagido.pdfIn PDF document text
    • http://falerisztika.hu/tmp/jesinupezububadatesep.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7194d884---fufavarininugemato.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8195093429---jalevonofugogofulobizo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05c83861ff---87092463458.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e5ad518d7---kubaminumudusuwikixubaxod.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/tudobukokufitifajetixus.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/e40f865777e7ef279b35417d0b3af165/puxoz.pdfIn PDF document text
    • https://unosms.us/userfiles/file/42281719840.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/wukadosagikani.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c149dba293---30476221396.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/be493c07e4a11df2110d9df5c561a203/wifowijasiredaja.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/97552a7e3c0dd4ef2734b544f52afdd7/masoxomimor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=turkcell+superonline+abonelik+iptali+%C3%B6rnek+dilek%C3%A7ePDF 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_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 18744 bytes
SHA-256: 4b79c0c1c43380d493f6c91967bb1705ab1dca608a1049924b1227a5ba858dc4
font_01_sfnt_off000144e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E8 11216 bytes
SHA-256: d2d11d75e887e08b4638752ec8f0b44c357f57fcee3a75aeb61f53b0e65abedd
font_02_sfnt_off00015e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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