Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb7935598ed1492…

MALICIOUS

PDF

144.5 KB Created: 2021-07-02 09:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e61c882c20459762beff42e66cdbf6eb SHA-1: 3a372f69def152c524cdd535358d0895aa310bb4 SHA-256: 8eb7935598ed14925e9c5f556735ec12922a81cb8388c292997ea9e700025582
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The PDF structure itself appears to be a link farm designed to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://bhsbeacon.com/FCKeditor/file/20777702800.pdf In PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942ba7dacc3---woredarut.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/bafudijikebofonug.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/32873376273.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/nobizajuvop.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/vimaribiposowav.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948222123eb---27966225798.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/2tbtlmioigfrlh3mdf7tlodhqq/61879506382.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/nawavofuvivizozidiwu.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/6437187721.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/93094001891.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/80543657380.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/fibuvijibiwawolakobamoj.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/527799ac2e55f9663d0c21c29e18a972/kezemo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160756a6353cb6---13412219498.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f37a7166fb---jubowesuliz.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e6ccf458---gaxotose.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/83175523043.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9608ad4c1---51589197384.pdfIn PDF document text
    • http://cjatkinson.com/userimages/77462142072.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/snpgtqgo0pdaaa17pk62621ts6/tubovogagalelarolupanug.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/vuwuraketodexidubaka.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6fe0b381c---1131952809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=nicolet+wolf+river+scenic+bywayPDF 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_off0001c2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2BA 10712 bytes
SHA-256: e5f1e16200c30dad49f3f15fc9009270e8a802b29d7040b3acea8b4d27bd3a90
font_01_sfnt_off0001db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3A7 26228 bytes
SHA-256: 919db3bcbd1a7475dec472d0bdb87ed80e5dadb04e2668a2288a7e4565977ee9