Malicious PDF — malware analysis report

Static analysis result for SHA-256 39821d3f892af246…

MALICIOUS

PDF

88.2 KB Created: 2021-08-08 22:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0808f720766aabc060fde44260c281d SHA-1: 15ffccf17b557e7fd732c979edbaf8fa90881988 SHA-256: 39821d3f892af246413523447cdbd97c3e1638e555c7762ab0fa13817b2bf8f8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://madmojo.com/fckupload/file/xerinonagumumarazifariv.pdf In PDF document text
    • http://stagelight.pl/userfiles/files/fatezarebijuzatisagi.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/d94175b42e2b9d9a4b729df1e415ac1c/tuvapikofafasunogim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abab32290fe---96348130284.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969f9c55225---40910616339.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/wafikuzevuviwi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7328dae6a---kapakotewedozip.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/zerimuraxovexobo.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/da3965dd000c954069d62afe125c2d2c/pejefukesi.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/resare.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/pibuvubepazej.pdfIn PDF document text
    • https://dineflon.com//files/19476459463.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/90a09100d88dd35f215dd366b91349a9/mozakoditeneraso.pdfIn PDF document text
    • https://yuss.it/file/zigokigawifugalaxe.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/pojodirumofobux.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/4f3a74e4fb08eece86b5a9bd5c793259/87313293542.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/sapewogivurupog.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/o9jf4t0co7482pinn6g23ef934/61322784973.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca303ae94a---buwotikukikulena.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9287b706---44623458671.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/78293523331.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a461c72b911---20875020585.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/3377419188.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/mizonekumanawexofado.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/23090687796.pdfIn PDF document text
    • http://sb-78.ru/files/file/22217598541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=vexilar+flx+20+pro+pack+reviewPDF link annotation
    • https://mediaget.com/userfiles/files/23639898517.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_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 17516 bytes
SHA-256: 5b6a87b0cb6154e321a743e1480e4228ffe42b76724020115bf54b6de811d991
font_02_sfnt_off000139ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AD 10660 bytes
SHA-256: ce17482629838c3de4f369f03f47ab6e696a04c1a3d017fb53c9cbc0213ce24a

Open this report in the interactive analyzer, or submit your own file for analysis.