Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2d6d8fb088330c…

MALICIOUS

PDF

90.7 KB Created: 2021-09-02 01:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a739b4d4135651fc355f05bcadcb0dd SHA-1: 6026e8d3c518434cf65f41931f0129ec2c68b55c SHA-256: 6a2d6d8fb088330cb46545873fc016fee2324b022a2bd6d3f75728c62d9c1379
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, such as https://inwebjor.ru/uplcv?utm_term=book+report+summary+example, are likely used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 6

  • 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.
  • 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=book+report+summary+example PDF link annotation
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb10309fc---dutewugo.pdfIn PDF document text
    • http://cke.hk/userfiles/87738799874.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/56317613942.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5b7b6836311492afd8eb9794fcf49568/xumitikezaveniseta.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/gukugizaruxaxaji.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607990a6cf85f---91713537547.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/89161523350.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16112f748bba1a---99027263983.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/xiruvifidematizipotikivin.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f8622e0d21e1dac13c6824b786fb2b2b/50420224308.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/e0a5545a73af1325f7bce2b629cb8db7/84515555941.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/vajirapurajozag.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/pejaributog.pdfIn PDF document text
    • http://tavio.su/files/file/52322205720.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/lfrgfpdjbnjmonpo7c6v40naa1/bugiguvab.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/12976351171.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/kulunefulexuguxap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076766943819---34299591759.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd0950c525---xoliwexatuxenadun.pdfIn PDF document text
    • http://veitali.com/upload/files/mirulonelokakutuw.pdfIn PDF document text
    • http://ge-mak.com/files/85072343314.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210726_691F5A4D58F23AE4.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/varubetaziwe.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/99623670651.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/50918438221.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b12d65d5052---21180282009.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c29cf0b01---niked.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_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F2 10680 bytes
SHA-256: 3fd1c1339d2d40384760619aed8d804ef8587947e46d69a0d993ec84c0f1474a
font_02_sfnt_off00012c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9D 18364 bytes
SHA-256: 03c278f6b3bd3736016320ad3f0208d4c11cdba095136e684e865e22aace2523

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