Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2fd660edcb800d…

MALICIOUS

PDF

87.0 KB Created: 2021-07-04 14:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b52404624dad73e1f685e3b9d3b8bed SHA-1: 53f9d09c17285cb267d81a27f79f30760b0c951e SHA-256: dc2fd660edcb800d54b096468eaf8dda22309648157ca3a2a5a604c4e66a2160
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malware or conduct phishing. The embedded URLs are likely part of this lure mechanism.

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 http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/l7a1orhr26h36ebe6p2mn2rth7/25635065418.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e44361c284---94314452400.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607324f94a907---50825605815.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/42867434900.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/povetukokewejizoli.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e74f25dd---59702827004.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/79395188960.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/46468b75d32645c765cef991fc4367c5/soxelotalogizarisipigi.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/69635308088.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/84349333027.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/ad531bcdc77e550567bb45e3a3ef90d0/59559247389.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/51502ac1cf9af24354260701d1f5f1ec/bugamamifug.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/f2qba59g4ip3q0q8flgjfh4h3b/72823206701.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085694e91837---58381977836.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/cd0048d36544a548e18c8074e3c09c7c/19478324286.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/3bb548661818dc7d0ce535c06d466487/xojatokegan.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/50e75d9d832204067e2d4ed89629dad3/pufogevajivefuwo.pdfIn PDF document text
    • http://alltechsro.cz/files/momikevo.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/77590080834.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b48cada895---29046773313.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/9114641050.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8bc0e82bf---toneged.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/mijigateri.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160787a0589ca0---dalebuveke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=successful+women+of+colorPDF 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_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 10408 bytes
SHA-256: 9b410528add2df5603e78ff969b996b673dde9ae571ee1e62abb5d7a0e793220
font_01_sfnt_off00010915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 17664 bytes
SHA-256: 36106cee9107f97a97c6ce7b8505e3da65e0993e1e3abc691fe759f9b95fce97
font_02_sfnt_off0001369e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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