Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb85028279e7c83…

MALICIOUS

PDF

90.6 KB Created: 2021-07-15 11:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1266ff9b8ca973e572a195bea2c57e7b SHA-1: 395f4df9b9a323fcdf1b404cce2e4a850e03a56f SHA-256: 5eb85028279e7c83bfe7b027df9b6746d9372725066ad136d5b78d687ba911c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment. While no scripts were explicitly extracted, the PDF structure itself likely facilitates the redirection to these malicious links, potentially for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5caf12ba0---daxumesifabupunuwuga.pdf In PDF document text
    • https://hmradiatoriai.lt/images/files/rafisagaxurezupoke.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/45453388737.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160732ab6d1796---tikej.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bam0b3g321bnnjbub27r66np5n/sejuwuxelekolugafesine.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/sizokusa.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c449f3e8cdc---7109318275.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ec6f27c5a39f6a3709fd1765ea79d438/bivujajawiwizogopasoti.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/wanalikujigak.pdfIn PDF document text
    • https://campermagazine.tv/public/file/tamuzojetegiwe.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/bewis.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/0a05ec31e6e19e28685c1c9301e47021/dexegevujomobetevu.pdfIn PDF document text
    • http://fitviewer.biz/files/file/rinudixefid.pdfIn PDF document text
    • https://ka-base.no/images_content/file/lotawigutasewuxopebufox.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3e12775a47cbf66cd472f7aaeb4cfc0e/sonumodozifavadaligom.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/341faa2491c8b7d1757c2cbe7e08e29a/modorevezuroju.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/bewunugusegalobewajo.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/sabigarenoralekubuwu.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/b2805b73d7d3e3f3f317ece9bba9fa96/navomusagir.pdfIn PDF document text
    • http://dakmet.pl/upload/90217105836.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/p5p87sc9su6mrhtbd7pi2iqaji/57981265489.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ce8bbf95b---lasopexosidimilemon.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/kalozoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=directed+drawing+christmas+treePDF 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_off0000fe0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11622 10740 bytes
SHA-256: 9169570eb6d10bfa31de9f22ad8ca13f29fc9603d0f8911f1b2e2bfaa2227895
font_02_sfnt_off00012e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7B 17384 bytes
SHA-256: 53dfee3d2c029f8c25eaeed3db65b4b69bb570100132072f682c7803165e890d