Malicious PDF — malware analysis report

Static analysis result for SHA-256 7175fa3bf0319941…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 07:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: b01da907fb1448b2840c4c5a074ad804 SHA-1: 15c23a7e525fe25300d5211c96e2721b79e358c3 SHA-256: 7175fa3bf031994146a00d3e93f6c5c53d5e82334fd0a6ec7247ea3f60ee272f
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://frutapac.es/ckfinder/userfiles/files/85132124131.pdf In PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/fenajivejepiw.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/ferifekirofovabewopupog.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/27667297559.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e6ce6faa---luvedolapafosuli.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/34440265427.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc70271d1---84569132489.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cd877b31b8d---9863916240.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/rekixolagazetazusewoxaji.pdfIn PDF document text
    • http://cartopack.com/Images/file/fobugefijufer.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/de38e71ea0de626910762637b104b191/zomana.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/2055572877.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/58295066736.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930afc8101e---kikovewawazajekafobogila.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/92990603850.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/42582102457.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/47917926670.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/51f77108342a653cab18ade2e47777d8/57080394696.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7eb41e179---16632600605.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/91546678685.pdfIn PDF document text
    • http://landia-print.com/pdir/file/32641046591.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/a7fd35ed6d0bd21c5c57eaa16e3a7cd6/24986716932.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbd7b0ea5---radiwebidi.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/zapifimotin.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/qonigabgkc1cbr7ijcuvf65vrm/92969473080.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160718f54afb0b---12235892295.pdfIn PDF document text
    • http://planbmedia.hu/files/bokuvidozupuwovuvuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=paniker+parasitology+8th+edition+pdf+free+downloadPDF 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_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 17988 bytes
SHA-256: ae4f9ccf03707ee41c7654fa14ef2217528a75e54becc9a46c629ce748ded997
font_01_sfnt_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E1 11276 bytes
SHA-256: f5cf3b6d2030206e22cb3f9349c5267df8bc9d10c053140d2bc801789067120d

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