Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5116545f671798…

MALICIOUS

PDF

83.3 KB Created: 2021-07-08 06:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 89b5545ed2c76eea8ef4fd52c233a675 SHA-1: 185c855ffed8d27feaac04305cee0dd44b56afbc SHA-256: 3c5116545f671798e9a1f35d49c7fd8f163a529dde0a3720bbc3af40c097b5ec
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=good+question+and+answer PDF link annotation
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/liniwekesaj.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1dc3abbd1c9b089a5625d2bd6b133d69/72744296194.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/94400750214.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866b693a3a1---66316488234.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/l70lk5dpj00ui5tn32qrp5ifd2/8457155137.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/59t94dvqcoi51ce31lohdlukei/todujotoxipinulizupovop.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/54322459742.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/vj3sgegnfldahh6pmdoa2r7m40/49412720224.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1c3b137986bddbad3507a9996af5f170/25229362534.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/40276341137.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6a0d280705c4cb777548acfec521d51a/bebusetesejefutelepiner.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/firixozofepuwadeliwulem.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde15163c34---fejumanitoxet.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607154531ef5e---godagomot.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da38758182---16794513809.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/67927227678.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/73094560150.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/51cd0acd427964f0d83f84560402884e/44422241617.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7f5db9a00ebe19ab58c6d48e890e6c1b/warobifotuwojexo.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/kgd2o7dssvra6gg4kku3ngvmb4/58815873015.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/ripemenafabalabuwepi.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/e60efb5d331bb8fe2d65a99d1b453f93/pumuxezobifogupigogu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a4eb1f4a1---73876865615.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/gogasadapixituj.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f866b1448c245063ca1777497199861c/28872340046.pdfIn PDF document text
    • 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_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 10564 bytes
SHA-256: e94b6ce05a0537ff2b86c661acacd10515ff1aa67f8ea97d04e5293ddb11fbe6
font_01_sfnt_off0000fa75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 17448 bytes
SHA-256: 49c9bed867d73f8082d3be2cbf86174d7e870f68fd4f05a29ece2a42e3e72ece

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