Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a8dc5d79fede03…

MALICIOUS

PDF

92.1 KB Created: 2021-07-24 06:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 388e58df222bf362ba355eb992ac1898 SHA-1: 4520fdad4f5bbee3fe5d5d35a4de74705b575d67 SHA-256: 97a8dc5d79fede039af9c770faf2c4b9817681220d36d766a0fb9377f067cbd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate effort to create a deceptive web presence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/fc1359e22ab3ab95d43cc9c668ab752c/jilamoxegujopuxi.pdf In PDF document text
    • https://communeouchamps.fr/userfiles/file/vubazelonupitada.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/56b1674b6386542c8b79569c64823849/safikipo.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/kevewakavugulexuwekitela.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/deb3d64fa557575470cfc980aa127a72/33333614680.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/51481840043.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/62332607924.pdfIn PDF document text
    • http://charivne.info/images/file/pekojunirogir.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/gibazi.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/h43s234udl62ht8rs4onbadk85/50742908270.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/sinevebatijaxemuxek.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/werorowuxujasamidodur.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/61072121179.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210630023413_s9h5aw.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/xopojomivawaxexo.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/xukexegesof.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d47d8d4d8---bufofisonemitazu.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7de5d8fd2a3ba959c3fcd5c079721c2e/lubasobexejimile.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b597d82d06d---mikugufiwusuvafexuk.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/40493859234.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2823c8cc1822f8ab163a3772bb9931d/24669051841.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3e707e7e---75897181181.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202169133613799.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/81336652755.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/xudawuwimusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=twilight+series+movies+free+download+in+hindi+720pPDF 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_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 11352 bytes
SHA-256: a467df0bc749e6a9722d52aac1b78bc7917123a87b37776beacc594270769f76
font_02_sfnt_off000133e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E7 17236 bytes
SHA-256: 112a3903075e3b6110594238ba5669e8b9517fca3c1f3b475c180b2d49946613