Malicious PDF — malware analysis report

Static analysis result for SHA-256 597a613d68f2c5d3…

MALICIOUS

PDF

83.8 KB Created: 2021-08-14 14:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7f411b06499e85e5c86daed11f8ae0b0 SHA-1: 144b5ecea8ab57f99471e685ed334480f2fe6949 SHA-256: 597a613d68f2c5d3b3a9eb9261ae95e246c3784d5d61d82e7d1fa8690f2d69a6
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm suggest an attempt to redirect the user to malicious content or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/b3l66n52s5oh2lorndonmm8k79/didik.pdf In PDF document text
    • https://hr-serdahel.hu/images/file/67783820775.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nasatafipilapowo.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23b39b24e---55795891891.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094ba78ec3ac---jexutalivolamaxuriwamefiv.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/81846938480.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/84064589915.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/wivovujabulimelofixatugop.pdfIn PDF document text
    • https://arerp.kr/data/file///9902050824.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/vebupiwe.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/fofuvefemonis.pdfIn PDF document text
    • http://chayka-svg.ru/files/jalurifamavililijunasu.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/26cb43474f4e0ce35d9b0885da0e0bff/79545031534.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/30o4dg7i5l6kdon4j29acccssn/36999291750.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/98477869318.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050221281973499.pdfIn PDF document text
    • https://bonacorsi.it/file/pititalikude.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/88d817d19cba86f273c31c4db076aa68/wikasuvojodaratemipo.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/22508954039.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/42846e78befb6e7d50923bcdea70e62b/tejororukutamekagije.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6818odvih9p8pvmmipve75du07/42258954732.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/juzoxivisise.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/63798689540.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/1qi8mrhhsts0llpk3mi9i068m6/30425808991.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115e1b9a082d---32796047328.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/borewajumimalupumimide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=11%2B+verbal+reasoning+practice+tests+with+answers+pdfPDF 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_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 11144 bytes
SHA-256: dafb798b9c98b617f74f105e529c3665e2e8557ef6853e4bd97b6a452eff757c
font_02_sfnt_off00011799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11799 15772 bytes
SHA-256: 2102d4e4dd41f51870bc120e682d57c54239f49c3ff8860a0b033c250deba8ee

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