Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a11db6ad32d9b3b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 07:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 62611b605023f40192aab08d322674ee SHA-1: 7812d6868841a0589160b2a8c2d2aa20612466cc SHA-256: 2a11db6ad32d9b3b494f7983435f8124eb6c38023ac9f4deb0bc0c5a3d84acdc
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://indecomavo.pl/inc/vakedalet.pdf In PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/5851f708111cc91054ddc5012ee76679/76668072799.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/dowulamemibaluwefuxi.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/31772755966.pdfIn PDF document text
    • http://lg-palette.com/upload/files/31634869695.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/90030716160.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/88439764392.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/kk2a43vkidfko0ig5kppsv7jdm/10321810320.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/lawawafulamovakifepi.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/lizavudilod.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/mugapikalevaj.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/5794972333.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/6d1cb24979040feeb24cb2ad1e065d6f/39457055210.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0383a1830---48772134393.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/kasuxumoxipokajufabubopo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf136f0a324---nepenenex.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/gesuvalibagegudunomixo.pdfIn PDF document text
    • http://merwepizza.com/upload/file/52383120045.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/wegivunawezexar.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/64102103260.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/73787493891.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85c46f4e0---38613992327.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/wuradinis.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/en2oefv0fvk6q4flad910dv71p/83747954954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=manuale+d%27amore+3+full+movie+watch+onlinePDF 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_off0000e0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 11024 bytes
SHA-256: 2593396923a83d67053985dbc7dce9e853e969ce4caed9f11adf7d5c89350692
font_02_sfnt_off0001127b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127B 17820 bytes
SHA-256: ae8f2740e4df4c4130728de1431a99b9fd22bb27c5ecd4acb7fb07aa97ed4f9e