Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd753f2555ed41df…

MALICIOUS

PDF

122.7 KB Created: 2021-06-26 02:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d7d07761a9d19f2929d16fe6597459d SHA-1: e86a33e0a4f6aa0670591c3ad1d4fae75a6c0ba0 SHA-256: fd753f2555ed41df1d796fa7c2aca85bd56f4e77e8e8582bad0646e4609c94cc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://worthingtonpark101.com/userimages/pinuzovigit.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b486838de42---tisusikefeputakoxopoz.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a65211bc---7557974336.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8bf690abf---luxekoxobotoxudifusuk.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/sogilegipa.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084422c92bf2---51796310823.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64b43b35b---lokinavimaranutosogel.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/064efd7dda662e845af3c206347d9031/36988581256.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ad251ba58---pilij.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160941e74e0503---bodofunujimugam.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gj5hu3o689r9sjj27913ddvcl2/jexuzuna.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bff524ad4ce---6318384026.pdf
    • http://stolizstekla.ru/userfiles/file/fogutake.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5d45f36acbb6911677eca128cb87654f/lozowux.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/58f9dd37f4b5608bbd0488652f9f39a6/pewidexepanaxoxojute.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c06990f393fd467e740c9ae17949638b/13876456563.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-4/20210504012825541241.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d660308e59b---lusawi.pdf
    • http://deurenhanger.nl/userfiles/file/zuwobizoxoxojikotuvuseve.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608878178080b---7219799227.pdf
    • http://buergerforum-tirol.at/file/89530668544.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8f5d4a6f6ac8cf34186df42666e5fb59/42167116876.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=birthday+wish+for+sister+with+photo
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000180a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x180A1 16792 bytes
font_01_sfnt_off000198b8.bin
4b8ab2a2cb3875c517854a9e88b731863a0a553d2260cc11337c69c240856e27
pdf-font-stream PDF embedded font (sfnt) at offset 0x198B8 10700 bytes
font_02_sfnt_off0001b17f.bin
46e52aa1b12023a49df31ec78eecab8b1e8d53c2c47fe38e80e421edf31cf787
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B17F 16992 bytes