Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f4c70d82cb2146…

MALICIOUS

PDF

84.0 KB Created: 2021-06-29 22:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab78b1cd146633e2b67871fd6d8a4cfb SHA-1: 37669760622bd67477ec1866558ca820d8a9da5c SHA-256: c1f4c70d82cb21466ede4ae9aaf9c70a6a1b53fcaaabe7b0419f0e6d8f435ab7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the link farm structure is clear evidence of an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/92v2qec3glnon2f18gvndmhh20/5381515719.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c1badc33---tijoxumozanage.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77140288cd---34581792803.pdf
    • http://bielwod.com/userfiles/file/86658807989.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608243558e68e---5614865402.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099789cc485c---dasurajeposeparavodu.pdf
    • http://luxe-pools.fr/i/File/28912041325.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ace5725c693---50303843436.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/07bead2325ad7f0af20c3d3a8f5fb712/73441035014.pdf
    • http://toyteepee.com/uploadfiles/file/210511082745259013bfm29l.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/fd355742b168357e43f97c38acaa39d5/4814819667.pdf
    • https://agrimal.pl/userfiles/file/xupomof.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec1d0e32a---48823999756.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95a5ce032---wibixitavoxigar.pdf
    • http://adabaskimerkezi.com/upload/file/vudixojilinikinebos.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/83b6330dee81efc65ea1f0555e321add/45532575570.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec353d061b---32983012268.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd5990a86e---91324483890.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608172b38f0dc---1795320963.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d425c630134---pufuwiwav.pdf
    • http://asiadomainstore.com/userfiles/file/17109390850.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/b6b3a6b1632a6eab2c2e88871943e760/39146017377.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/662b58b6212fdd13546ce13de12e0b6e/82939247386.pdf
    • http://elcampoeco.org/FCKeditor/file/fulupejalaxigi.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/cdda32ad5d6c88f3288d8f0949aa3f07/29131970762.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=morning+images+beautiful
    • 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_off0000e65f.bin
c6292a08da47e4b974fc54cc39922b0ef8ec4cf3d2ae87297efc7ec81ac9e8f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 16828 bytes
font_01_sfnt_off00011213.bin
78af9d41aab1e46b30adb43b2a4fa5c09029d3ccb07afc07e217189ad4282100		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11213 10788 bytes
font_02_sfnt_off00012af3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF3 16792 bytes

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