Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2087fe2f6c1155…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 13:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9bd42586e358829f1b686d90f2bb45fc SHA-1: 86ca6f55502fd8402d92cc91877db83d9472f4b9 SHA-256: ca2087fe2f6c11550e451740bba96e18eb3406300f0f3ef9944377619876be02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://doellefjelde-mussemarked.dk/images/newsmail/file/bejobi.pdf In PDF document text
    • http://mingmitrcoffee.com/user_img/files/45039188345.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/pavezuvikevetozev.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/ganusa.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/duvoboluzufo.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5690d395d8821fd9b28590bcf229e906/66031185009.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/30524260776.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/rajonagigutavukowewufo.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ef25db6be1d349d9f2c308027ba5c0b0/zixapixepiforejevez.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/71458530781.pdfIn PDF document text
    • https://cape-electronics.com/media/file/3982818509.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/afbc3a185c342f3eb6083bc30c410d41/basijovumesimuxu.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/mufupe.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/12041047255.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/id11v3l57q5hno5j56h4pogha2/pedidimorusenixede.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b8a0fceb---91101689528.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/gudekob.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/42891808365.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ed3444d5e---80171646057.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080edd1e53f8---17929539875.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/aimg11oc4pg1bb7e1m9s60ln05/62004732479.pdfIn PDF document text
    • http://starsunited.at/upload/files/36597426206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=communication+skills+self+assessment+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_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 10904 bytes
SHA-256: b9838be46af5d8b0f47e6dda9d90d8d5d7ad066806d77ee9c086b542ee756c5f
font_01_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 18156 bytes
SHA-256: bc5336f441819a28e0f9da9d436e0eb9ee9980bfe68519dfcc98cf2f70bbbc22
font_02_sfnt_off0001324e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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