Malicious PDF — malware analysis report

Static analysis result for SHA-256 491f6533e49cbe2e…

MALICIOUS

PDF

74.6 KB Created: 2021-08-26 14:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1b351439590e090964710af4311df02c SHA-1: 8bb2b2eddec1f42d9195c8a7008c807a5f986155 SHA-256: 491f6533e49cbe2e6b078964e36805de08219a4fe6023f71b02aae46b2ec1854
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier returned a high probability of maliciousness. Heuristics indicate the document contains a link farm pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://annekienlen.fr/imagesfile/roxemib.pdf In PDF document text
    • http://gld-lining.com/user_img/files/31231442089.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/tajaju.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/dotupikiwepuvanuvuduvur.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/maxikuv.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/91435830669.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/91112511790.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a433a02e42d.pdfIn PDF document text
    • http://poorclarescork.ie/images/8070553496.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/xufufigipalobadajinoxaxol.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///82958166309.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210815190152.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/zakibibesomokuvodofisubuz.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a257dad70---87709387228.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/pamepafijegagewuboxasegi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b55cebb75---kawojoguga.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/41762cb2d9f9d03648f43c2a9d3b6fa0/toxidefagitewovujasu.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/terodulogo.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/1c76f3fd0f9c59c4471592c8c11b7679/72033868331.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/81911525570.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/98282754077.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/77278017510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wife+creampied+by+blackPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FC 16388 bytes
SHA-256: ea0a6c932765eff6bda7a6bde349feba7daea3d293563357aad60a88a4a7780e
font_01_sfnt_off0000ec09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 10632 bytes
SHA-256: cb3228ac95031d529da91dea3bf0f88c699cde640b584a3d2665f1ca47956c6f

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