Malicious PDF — malware analysis report

Static analysis result for SHA-256 154cb8daf87a2f40…

MALICIOUS

PDF

93.4 KB Created: 2021-06-25 19:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22bef9e8fd281922293810073e874f18 SHA-1: e21735da300466e00640e6ed50a04594ff856246 SHA-256: 154cb8daf87a2f40afa847e5aa3ae76b5ede9d26c39c507297c5a660ea336b7e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. The primary purpose appears to be redirecting users to potentially malicious content, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://aterhesseg.com/up_image/file/69746970469.pdf
    • http://jubileejec.com/userfiles/files/52854367901.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7dec7cf91---funerefifovowutovo.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/kildpc0ghug5dgcu1ehl1d7hl0/zamivuzozofivotazuladolo.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/079fcc5508e95bc398d7b9b65e342e8c/92230426475.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/6vjsr7ueu5911abisaid5olj3d/54948515565.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bb095e1158d---95051966897.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16076d13e77596---88132298325.pdf
    • http://osteriadelcampanile.com/userfiles/files/rowogemedu.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd9da2738---63122103494.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160725c190e6b8---86801060737.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982a94db76b---58696161853.pdf
    • http://ozona.pt/wysiwygfiles/file/zugifurelixegusemu.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160902205dc2cd---wisomig.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d497f31bce---41344180389.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/77faebe2bd9f21c73eb82615664fe34c/78697756807.pdf
    • https://communeouchamps.fr/userfiles/file/35963243003.pdf
    • http://global-insurance-broker.de/downloads/43482770998.pdf
    • http://christopherdallo.com/file/gujivipekipulimo.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac59a52e015---kefetelaledefi.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e594ffeb---22331097753.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a35e2d0acba---49888021350.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=isaac+hayes+wherever+you+are
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5e.bin
bbc199be8fdef1795d8c12c497ab4b0625cbe95ccba388a5671b0528bac5f23d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 22436 bytes
font_01_sfnt_off00011697.bin
c2757e95e513cefd7921ac54c6234a6eb3c0d43398fe04e0779516c97ee1194e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11697 10304 bytes
font_02_sfnt_off00012e0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0F 16792 bytes
font_03_sfnt_off0001461d.bin
dc9199191388de39fbdb1fe53053facf946d9eec24c82fac1a5b5bae1e3e06b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1461D 11184 bytes

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