Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce9b315357aaf3b…

MALICIOUS

PDF

93.2 KB Created: 2021-07-29 21:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20bee78a1fe323f8a3f90301652b8708 SHA-1: a85ef8706f5851c93ad646bd8dac9ab69582032f SHA-256: 4ce9b315357aaf3b2ce9a57da2742be9482d14fde5c6f6eddc95b66b3347e450
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, specifically targeting the 'formcraft' and 'super-forms' plugins for file uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and link farms suggests a broad, automated distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e3af6f424.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da43b131dbc---renegelinutewavubiso.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/towubudigifogowu.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bf98d96c67d---7596047620.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/57608279522.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/ikplbpp02knsqei8dq32torfbf/57271707382.pdfIn PDF document text
    • http://kalikraft.com/images/file/setowixiwap.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/87211850273.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/48684390477.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/92099738467334eed542278f18530ea5/sesetuwudowizexonaxitufi.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/7832310118.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/2f3i9o5lbo65np7p9ob6p64o4h/5663562610.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/903495f4da86ec54ed1b1204826f31e0/96313836583.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/jevupegigokuwibasiba.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/35579309905.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/24765876926.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/denokodetolu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d239a7d9ea9---fuvezifuwa.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609f28150b573---34868239711.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c8066b48564455cfec96da0c2ae5d73c/88900879934.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609661ecdda89---tigefoduramejumiz.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/d022p00j8qfl0ivd6h52ge4ufu/giwabiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lord+of+dice+tier+list+4+starPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 17364 bytes
SHA-256: 869fc6fc27ace467d7a91d88f9a26f226c8def89df1a6aebbcfaeba5ebb37211
font_01_sfnt_off000121e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E5 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off0001372b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372B 10400 bytes
SHA-256: bbcdf7c914a24b569ecd4a79278d38aa81aebd62df18ce0a04fb288a1665dbcf
font_03_sfnt_off00014edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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