Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2bbd671f2ec4a3…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 23:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c06149f0510b6baac32992350016d17f SHA-1: 43a7f43963fb235cbcedbfc4b882bdb06edf6b09 SHA-256: 3f2bbd671f2ec4a37282eb88438d44965155cf26bf8920e302342fb300b7ca29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The presence of these links suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://chcial.ru/uplcv?utm_term=transistor+equivalent+table PDF link annotation
    • http://anandtouristcorporation.com/uploads/pixupuw.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0799ae5202---22944229564.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/wimavapaguruwe.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/82442552738.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/43530167729.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/6ed97323e58a948296eb671eb5baed38/xutuzuloxejukurat.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/dijiraxutanagunevoxum.pdfIn PDF document text
    • http://kes.org/upload/editor/files/zatuxigukep.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/zajemujibeki.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/nodakagerogidu.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/77dfbb1fee6bebc35758b6ca58ec7650/simenotemixaladevo.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/lisisakafuvivet.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/99377907653.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/2235006304.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/57899288627.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/836819dc3f06cdb10665420b2c9f918b/duvekanafokidi.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02adc5d2e---masovilejumebid.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/2a1ea7b2f1ad315d9f2205b873f8cd95/kedajenepi.pdfIn PDF document text
    • https://rosycaffe.com/file/27233813807.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d28046bbaae673f5e8829492c7f3749a/rewadixinejuzutize.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/15d1d947d9fde2045dfe30e686b53383/tuladetuburimiwetisoji.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_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 18256 bytes
SHA-256: 8be418054b035cb0ba1b27f8fe94c15d51c1d19b6597e128048e8ee196dad22c
font_02_sfnt_off00012e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E57 10516 bytes
SHA-256: fa554e0704e0e183008469901a2c2c50ecb42d2e7a8f8144cb278138a1a9768e

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