Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff066aba55a6a0d1…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 10:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 083a9d046edb0bc82c564d73b85afba1 SHA-1: ffd14946964d08a074ce47c117a729cea4519dea SHA-256: ff066aba55a6a0d19b29f6de303d77dc2254c2ad5e6ebd1c983dff611933348b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/3255f443cdcd44a934d5500f15786898/makosibe.pdf, are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://idrogastermoclima.it/Utentifile/FCKPage/file/53007902099.pdf In PDF document text
    • http://studiogaleazzo.eu/userfiles/files/xipiwopinod.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4f1445108---34789069582.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/fb3da88e125395eba97aeee948b7108f/genotumomujasisirevopa.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/24940096532.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7f7bbd4baebaaf735722bcf4b5841883/xogudefanut.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/mupukorukijagatu.pdfIn PDF document text
    • https://partnermind.cz/images/files/jibobexafawakojotabukowiw.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/2237591611.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e325d02d9---tawipe.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/palorikozumob.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/mejugeluvimofozagemabedo.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/67bc352cce660ac62ce26ad502a9476d/77400383592.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/11747716143.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/votagakenisuxeliloz.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/51ba948adc592798edd93ef7405be1fc/59364027.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/102083319.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160889534ae0da---latirasopigisuliwateg.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/8227597832.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/3255f443cdcd44a934d5500f15786898/makosibe.pdfIn PDF document text
    • https://rjpexport.com/files/54334874901.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/31568175101.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/baleketefaxufotizuziwaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=laboratory+equipment+and+uses+pdfPDF 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_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 11068 bytes
SHA-256: acd3e0649173ea1e84763a55b1632140c0d26877a80913040ddacb46a65e1ef6
font_01_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 18588 bytes
SHA-256: a097a8c26a9f07099500b98f2ba74774dab4146321ff69914819fdab1bdbb1ca
font_02_sfnt_off00012951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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