Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eefdfc4590d8617…

MALICIOUS

PDF

87.6 KB Created: 2021-10-07 02:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b8c04e2b2965c4ca7f1b7cc01564c890 SHA-1: 8ebfd7f5185f0c96d5f1a1ebc953f6f7bdfa81dc SHA-256: 7eefdfc4590d86179e4ac618ba873a3311b640fcca56ec1a38d1ca71e9629934
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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=project+management+interview+questions+and+answers+technical PDF link annotation
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/1ccb637c0c01ac90f978460b9a67d974/fuvisomawofolelumos.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcfca4f280---78510511555.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/poverosajoderow.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/numefojokukavuf.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/nasonogufimefevawi.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/89964156012.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/8eb1626a0ae4c2962b12fa7c15395399/13660236806.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/zaroka.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/bovozupoguzitujiketalosi.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb66eb368---15836977754.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/89541896169.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/ranokasajexedobinezelusa.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/muregogejo.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/jinuwasi.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8265c48b19bdbaa5256b6331f74161d3/vimusakarapisimas.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/nufodubazevakizavizomefud.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/kerukover.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/rolovan.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/72459192864.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/xokujobuxuxezirunaberebun.pdfIn PDF document text
    • https://dfkcnc.shopper-store.net/file/files/zajikabosubazuja.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/66163329934.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/pogebofotibigepej.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/wuzogosobifuvudamadoki.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/dijopideve.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615c1e7e18600---kagefaxuzutebazukobitokit.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/54377442227.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_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 11348 bytes
SHA-256: 9fca6e48ab345283423f785d3a26aa99902b8b2b7aa0d36c6415f5ac3f906733
font_02_sfnt_off000123ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 16852 bytes
SHA-256: 2753bab7af2c2d12295234c8c99babc7526d03a607a78df01522fd62b8c5206c

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