Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da72dca4842b07a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 19:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 16672a42c998d9b55c879a0c91d7f5fd SHA-1: f3620f03477220c7a49b9b23ec17f7cc93240e8b SHA-256: 9da72dca4842b07a66611b6b643fbbc1e259251bd08e0409ed04dcc44e4a049d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The embedded URLs suggest an attempt to lure users to download further malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://cobrawire.com/userfiles/files/65777094316.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1d7131aef---jemuxevigawivuronogovak.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b411c28a1b---41759083730.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/jidadakuxomafebetut.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a483e0e098---vategedijurobasixuj.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138de4a16d99---gewokomo.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/limitewugoxalipejaraxug.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/purarosudowazilenuzuja.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/wepove.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109122222456354.pdfIn PDF document text
    • http://poorclarescork.ie/images/81622576430.pdfIn PDF document text
    • http://firesystem.ro/imagini_ws/tolijedoweloji.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/tixipe.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134998cb05e2---48728889271.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/55179566043.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/67866767264.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/xagibivirufuriba.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/13859676183.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/ximudona.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109030245342325.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/wekupomuberenuzonexubi.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f56b6c06c---lexutalopowidos.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/naxozonewakujuluxexok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sam+harris+the+moral+landscape+pdfPDF 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_off0000d482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 10960 bytes
SHA-256: 5645524e086d1bcb745b5eefd2122668998897071d4c97d8d1ff9f9094f6438d
font_01_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 18096 bytes
SHA-256: 6612e45aee73c6ec2802fa8c1f092689dba08bff9d7d40562c0d4197aa6e5b0b
font_02_sfnt_off00011bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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