Malicious PDF — malware analysis report

Static analysis result for SHA-256 858a404de942f3f9…

MALICIOUS

PDF

87.6 KB Created: 2021-07-05 21:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 75738448aff60f1b9eea722fdaa223f7 SHA-1: 75235b8e409d8678d5710d6b3f96fc3a5fe600a5 SHA-256: 858a404de942f3f9c3cedf580cb8b5496e7d7c23d62dafb4c9392ff6f06b1193
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the exploitation of vulnerabilities or redirects users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://inwebjor.ru/uplcv?utm_term=military+bah+pay+chart+2020 PDF link annotation
    • https://rpitrade.com/ckfinder/userfiles/files/dazub.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/acf0d706c73a1bb617ee07bb95eaacc1/65296446711.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/09eed35d6f151f5a94e9cf39d7fa7a94/10051818165.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832404b909a---nujexetebenunajuvovikus.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/93550221291.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/4387d0e93686ea563a0e09916d11f632/siwuzusav.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/04a1ac65e9b68b06a39d9dc56163b8bc/99324552039.pdfIn PDF document text
    • https://goodline.by/userfiles/file/jezivamu.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/vasosizol.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c0eb75eae---77011226625.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160affc9332d52---sezananukuzekoneser.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210624115908_4zdk7p.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/wixoxijigugebezenu.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/d457f617c011e44f4671c69a7cd601c7/kekewadipuzonisosogesot.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/35258443208.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/48232855291.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/jurak.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dadd4215f91---51472908631.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/35dhm9b42p1is11i50u6iepigq/risovafipafukiw.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb479fc6e25---57801383554.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/57064127690.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e3e04bef23db6b8e2454cc16f6f9976d/66623821269.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_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 10436 bytes
SHA-256: af948c0b34cf4e5f609fb31d5be6535315c78677826066d9717ede779e345900
font_02_sfnt_off000124a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A5 17132 bytes
SHA-256: c1558740583d915dac93ff57ea2d45ffbe3799a35d9f8f72526a0651111aa94b

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