Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b78f1d4c1835708…

MALICIOUS

PDF

80.4 KB Created: 2021-07-13 20:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 352767fa1930cf5724454f138e5afca2 SHA-1: aab8e68632aa713a99452295b41360e74c35e5cf SHA-256: 5b78f1d4c1835708bf8627c22517f239326d859cd6119a83382718682b4c65c5
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories and other potentially untrusted domains. ClamAV identified this file as 'Pdf.Phishing.Trojan', indicating a malicious intent to lure users to malicious sites. The presence of multiple links and the use of compromised hosting suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4803

Heuristics 5

  • 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
  • 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.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda2c3674d---kelutobuvo.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ac04ef84e---jelodufukebeka.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/movol.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/1ede6f98c3bb9f7a3e222795c013b37a/97485516142.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee0f3ccb8a---peleluwolalor.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/5152317260.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/16636836671.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90d1e3f52---31426300615.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/63075496323.pdfIn PDF document text
    • http://aven.su/userfiles/file/sefijuduvoxizuvokubule.pdfIn PDF document text
    • http://standdominica.org/files/files/30389099095.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e86ffc8784---wazal.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e1c3bc5c4---42748722705.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0d01f83be67e0bb9a6b3033812ba90de/fekifivivodamazulegaba.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/posolenefoxalipobe.pdfIn PDF document text
    • http://wamer.org/userfiles/file/gojetew.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160826c09e74eb---zudutedimilinomovugiruwa.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944ba9e4d8d---89532849635.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5fd8cee9e99173ac42be7bc4b6a9218d/19160293487.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/tumit.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/rn0pub2sbo7im62lndtgokb8fr/90532749791.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706412b3e7c---20659140561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pitch+perfect+2+watch+full+moviePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 16932 bytes
SHA-256: a9fc0fc53f28fe3e853d12311f9d062a169f41d4f78b589f839a4fd3100084a8
font_01_sfnt_off000124de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1