Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0483fa4ef07b998…

MALICIOUS

PDF

75.0 KB Created: 2021-08-27 23:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4374f0a8a9bc2cdaf5983c5ac2987c8a SHA-1: 1d752649bc81c5255f93b2039c4b3682cff0b5bc SHA-256: e0483fa4ef07b99841a5ed98db9131eabb8e7e7bc59a8c12f9c09e41f94d72c3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The primary purpose appears to be directing users to malicious content hosted on these compromised domains, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://clear-es.net/yamituki-n/uploads/files/41811887678.pdf
    • http://sourceandsecure.com/uploads/userfiles/file/51889563024.pdf
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/39147011426.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d5b9ad89---remezolefebewagotaxene.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u3qbco6rh2qedg8lip6rffm5k0/wetumudowumexisemarawuvil.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/akpohuhiped8bllraoebugpr12/xodolegopipenogi.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/55d8965b408c49776c419ab11bbf4b9c/butetodasiwibemelew.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d5c10f32---40666234014.pdf
    • http://sl-light.ru/design/img/upload/file/48260918194.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4c9fb4074fe9d5c7652077e2f190fc72/54574891638.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f07bfed2fb9---43321707350.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088c7291ef72---1154513109.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f38e37473---sotokevoz.pdf
    • http://cjandjunemillerfarm.com/clients/75830/File/53742207106.pdf
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/39429511250.pdf
    • http://samocvet.org/foto/ck/files/sokavikuwojox.pdf
    • http://tatagz.com/uploadfile/files/vetujisugovinizadi.pdf
    • http://coiffurenais.com/userfiles/file/fizemo.pdf
    • http://detikakdeti.ru/img/file/13795414067.pdf
    • http://darec.sk/files/files/verunuw.pdf
    • http://csc-020.com/userfiles/file/20210613202502_1rifry.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ebcd34e72---ximetezadilizizotazol.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/26025365801199eb67a2bb22d16cd801/72651299976.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/c289bf589da81cb182c1828218efafed/lobetosoxizapinexo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=princess+luna+my+little+pony+coloring+page
    • 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_off0000c047.bin
9da15ba03dad4def42506903bbe4335b81606b9a1528bcee648180ce14f256f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC047 16904 bytes
font_01_sfnt_off0000ec29.bin
6039d9b5ba68fd56657d0556a0db5dc2d9bcb4db46147902dc6c7cab5b6bb392
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 10932 bytes
font_02_sfnt_off00010589.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 16792 bytes