Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50456bb67c13986…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 23:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6f317f3255a278d95a497df5efb6ed1 SHA-1: 87076f74882910bd8980516668ff50e4e3b50789 SHA-256: d50456bb67c13986ffbd722a3a0b995eac4899d79dc1b70e45760ba60f9d0358
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains an embedded JavaScript stream, which is a common technique for executing malicious code within PDF documents. The numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggest a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://queure.ru/uplcv?utm_term=bushnell+pro+x2+golf+laser+rangefinder+manual PDF link annotation
    • http://anhbanglaw.com/userfiles/file/19966531836.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/kulonabanovutufuliwa.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/72653735052.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7684f9e67e3ba869463bef7a4ec61c80/totisoduvudum.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021080411372873499.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/64795697520.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/58456145771.pdfIn PDF document text
    • http://waterreducer.cn/d/files/zemisewidupatogumawa.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7d69e2fb1---wizizudunekejoli.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/jakabakasililexigaboweve.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/68c3ddea6b286e0cdb689b0ce1ac0e40/kebifinujeziwozuj.pdfIn PDF document text
    • http://klefmarken.se/upload/file/10758290479.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a056757d121---37277795443.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/26098636386.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/90795594019.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/78976890623.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/rg6vb4a5gpip6h9jf9eldckh34/lebusanixufigabudevuxusi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b30d7f93809---85077289999.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/27304021926.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/jobulujo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d422cce3243d58dce7958e2bcab9b071/15010874314.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_off0000dc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 11224 bytes
SHA-256: c865c7053ce53bd436adaaf3057712f91375926b4ec817e6fafb4c5ea9cd2c2e
font_02_sfnt_off00010e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E25 19808 bytes
SHA-256: 0f8a0f29afdea1b02cb402c9452b88368f381577ca92fb56822c81be8230a59c

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