Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3176cc867c60d2…

MALICIOUS

PDF

82.8 KB Created: 2021-06-27 22:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9bb826f1a8a1a196df3d1cf2d40e9094 SHA-1: 17c9de273f39988faeae384e2ece08cf2209d58f SHA-256: 8d3176cc867c60d20245491c2c1d481b22887002b2aeaa50b5ca4f8ae1c6e6c2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is heavily obfuscated and does not provide clear textual clues, but the heuristic findings of a 'link farm' and 'compromised CMS upload' are strong indicators of a malicious URL distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a20340105df---13050950665.pdf In PDF document text
    • http://blatt-gruen.ch/files/13239070663.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9a171055f4aff7af7eb86469f02d2d2a/35995419723.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fb3161f44---68823549520.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/fekabutafod.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a24222fbaf8eccdf34e0fd6840c39e5a/sapotexarebuzam.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c90887a50f7---79909924629.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/90388573595.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56235aff8f---57542052025.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/42794397284.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/47395101356.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/20416ba7f5411a72de303456dbfe9c7e/26280480150.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/bprj2b5bbrqqt90dlubn1ekfnf/74683401081.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/94300979209.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/592640796.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a39dcf24b63---nubuzeri.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/43895cff590aa8da751223b88f785562/renegiviwinupivu.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/juzebededetomolawijavere.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73c44808e---62147769478.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/bk67phh5vss1dc9v8385on9skl/54044640905.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/67440909797.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/gedovusik.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/pmicq9g54fvktr3u101flevc11/21006885441.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/25916985776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=repent+meaning+in+odiaPDF 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_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 17224 bytes
SHA-256: 011b53b3ead6a547fad0092f5cfe0fac44ebab9b96471a5392b546a4d6dbf558
font_01_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 10464 bytes
SHA-256: 1a758ad784e63843d457061e31d88a17f6c491133b9f42025ddbf90bcae46422
font_02_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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