Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6217efb3a2fde69…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 20:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed6e1f43ecc24fa064bc4fc02f7a56e8 SHA-1: fc4f3e8710260b46ca03d2f1a6009eea6ac8e782 SHA-256: f6217efb3a2fde694c8f465f7d9b490fd1c4a546db99210e706559f0bdb35948
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. This pattern is commonly used to direct users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://skogsformedling.se/bilder_umeny/File/jigakavibezonixedase.pdf In PDF document text
    • https://avela.md/userfiles/file/19192158480.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/bupotuvitewofuranenux.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138211a2cf0c---todovikeponofub.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613163abd7318---99453484023.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/vozobexobinidoza.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/zafalonewevegezavag.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371ca1e2551---bagul.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613880e04110e---weromubodazovipolovijibe.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/folesuxafiwakazipetu.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/lilepara.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613427dfe5729---fiwarapusuvesofajuwalonu.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139ecd932c94---vagupediz.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/banatabivutojatosex.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/lobumixu.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/wazebusoxe.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/12342667123.pdfIn PDF document text
    • http://naso10.com/userData/board/file/xexowukiropugonuroza.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/9296452605.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/22640025229.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/56652163319.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/vogumevenibimeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=shadow+fight+mod+gamePDF 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_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 10544 bytes
SHA-256: a6f6b3a596eb43cf0bbb1e3f78214533164557ea3cae5d665436bacd9c003986
font_02_sfnt_off0001077b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 16868 bytes
SHA-256: 613688eef917f48beb9cee42ae1a4f72ad72b1ac6401d2b91bab31e278b817ba

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