Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7fdada68acc9a6…

MALICIOUS

PDF

98.2 KB Created: 2021-07-02 10:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 214c5006cb5095c77364e14dcf0beab5 SHA-1: 10d2ba16f3b14c03e53be45a534e7971eb56adf9 SHA-256: 8a7fdada68acc9a60fa3cfa03939a03088ef6942f8ccd5230ed0d12746827e49
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is often used to redirect users to malicious sites. Heuristics indicate the PDF is a link farm hosted on compromised CMS uploads, suggesting an attempt to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f861add8a2a161d2b8cba596006da780/gemakakifewon.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740e109434a---pepita.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a0c23b95158a0e9b45bfd60db123aea5/31901529.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c522e07e9ab---vutotasigufuxakibeje.pdf
    • https://medtek.vn/storage/file/vapuzafusivamofolo.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/af9fb14f183fe9698fe6a3fde9953257/40814940388.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/bcaaf360dc04a411451667b27861bf79/2161323472.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd19895ea0---tevogafaludeminer.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/52707408653.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c37e3097c0---55946175698.pdf
    • http://bhk-aindling.com/userfiles/files/35533036160.pdf
    • https://foundryindia.org/userfiles/file/12751802537.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/kutuvolazoloxefugiw.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/evci4a0n4ju6996af77gf4d3t5/gawubemexebebojiwusebuwa.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/p16hf1sdokp85d9o838sqvanl0/kuforabefu.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ee361d844431f2ab6e20cc4c6beb1ba5/7097310818.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080487c13f89---badinafap.pdf
    • http://ufnk.fr/app/webroot/files/file/fofuwitudizerumen.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e1caf1002be2ce350c745122e71fd12f/3647697648.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vj50umsrg454m12ldalpko9ht2/45174124234.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/opkc6k5nq1sognihhroiru80r7/6034482632.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=co+opted+meaning
    • 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_off000103a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 16792 bytes
font_01_sfnt_off00011bbd.bin
3274dd2c4052ac3f2466f9381369b5d7dfa7e515d4ddf19b998c5f4ac103e0d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 10452 bytes
font_02_sfnt_off00013338.bin
6493f6e5d2d3aa9bc23cd1dd98f40f20cd58f777c0f0a350a9d7d5e07b1dd1b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13338 19468 bytes
font_03_sfnt_off00016476.bin
05bed187979e001a02489451bd91908e79dad7712604eaaef070bc9dfaf14c54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16476 16132 bytes

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