Malicious PDF — malware analysis report

Static analysis result for SHA-256 b600b36d8573d934…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 05:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 674e0849bdfa3bb28d316c2b59913adc SHA-1: f89df5dc02aaa902b8fcdadd6fe98b055f8ac73f SHA-256: b600b36d8573d93470d2c92b2fb3e07bb7101b23e03a2dcec842059a3d70776e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of multiple external URIs and a link farm on disposable hosting indicates a coordinated effort for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/oe1045mlu2fnbn47ct42k98hrn/55754914254.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4235b4890---vejopizinoriseli.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/75e3fd39f07a860bf127d0aa14e47cda/45905690980.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607b3fdfd35b9---6016455522.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f25fe479c290485d3de1e871302902ad/vavunititorepulubawib.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210528081801.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/57937857343.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/74c7cd22b7ff1340e5596e4cdcbc06f2/sulukuwamuvuvajaboludiwo.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/415434774.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d54a1ed1---xogim.pdfIn PDF document text
    • http://devison-matras.com/upload/file/40813388738.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/sebijanesezuzikumunelo.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/biwisamugimado.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/felefazatevuletakeledakix.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/getikitiwax.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/pawamotigitanada.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/dojifejelodarilovogebew.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de5c3e9109---35191563141.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/96a0ef07ed14dbaaf54601b67a94d604/15594447915.pdfIn PDF document text
    • https://hocngoaingu123.com/upload/files/rixisigokex.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/21944780290.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/s8sr5cir0g8m2lq635l61rtgb8/wewudefa.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeef0d6693b---temotuviwuwijejara.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/vasinalefafun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+cream+color+paintPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 17588 bytes
SHA-256: 97063f18486ff2878d3a49ea9a0dd2ee64ed5f1aae3cdf60ca275a439cdbd91f
font_01_sfnt_off000114ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EA 10536 bytes
SHA-256: c1d65a60524b1af60070fe26b12225b4f17fcb84699a42717a6bd99362a10c54
font_02_sfnt_off00012cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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