Malicious PDF — malware analysis report

Static analysis result for SHA-256 712200443bdde80b…

MALICIOUS

PDF

81.9 KB Created: 2021-08-10 04:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d7818b01365ac155e4e5326035f0f29d SHA-1: 195d6fe5747014e8d357e57d8fa15392782b1e66 SHA-256: 712200443bdde80befdec0d152c1ed074c0dd42cf675779ff02ba7a3785d17f6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it with high confidence. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=how+to+pronounce+liaison+in+british+english PDF link annotation
    • http://hytechplus.com/userfiles/file/tugub.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd9d3e907---mujevebemajine.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/41543328649.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/97563046377.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/65072271961.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e1dea102fee30f9bfcf471a2c396cf51/18728799197.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-7/20210507103418936186.pdfIn PDF document text
    • http://cl-pub.com/files/files/bubidesufuvezig.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085c67fe54fa---30753757926.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/26163569226.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073ab14391b4---pekosogajefigan.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/pavejisatubeketosodop.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/tosakizupilozadan.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/43d558beb5aa1dc069ce4ce7f08cf950/koxejoroja.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/rilubiwazokuxukozivuwor.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gewuzenufizulipujemib.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/naxozulad.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/f2e63a4febe8e205329008905e218ea1/84454721851.pdfIn PDF document text
    • http://abnicum.ru/files/file/2301126810.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/59b057a074b534f34152bd545ffe3f3e/52334462122.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b030d332---suxodirelajuwilakokado.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f0bc31eed16a25f19067eea9d8705e76/povupokeratetekizegatuxe.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b738b843f89---lafibuwokej.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_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 18384 bytes
SHA-256: 59b8af80e676db381c39533fdb358932c3c10594894d4f7eed5d830dae4ddfe3
font_01_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 10968 bytes
SHA-256: c55b2b41a4fb9e5ee4875f62fe0f345696aa01435da3aaf42c52c12ff42110cf

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