Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94cb4fb90b2347f…

MALICIOUS

PDF

86.6 KB Created: 2021-09-20 07:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 27fbe83f6c4768e3f349ee12d823fa61 SHA-1: 652a9d64312081b500a26bbdc9e18efedd40909b SHA-256: d94cb4fb90b2347fb1a696a052e061fae83471f64e39743fecea0f488c21e9e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://chcial.ru/uplcv?utm_term=samsung+galaxy+grand+prime+firmware+download PDF link annotation
    • http://word.mn/uploads/assets/rimovada.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/vuzitixamowumile.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/94587477840.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/fivojubukezivewivofavu.pdfIn PDF document text
    • http://sgpeo.pl/users/file/35522653259.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/jovoxujutoselokufek.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/vebikizupoludadibelubuke.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/92942708995.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/pometuraraxew.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613372d78062b---76297865052.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c69325d6a---penavivewowujolamisipi.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/borarazononawonivojezu.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/sikemixawedusomowab.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/12644559422.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/90501151192.pdfIn PDF document text
    • http://novafish.it/userfiles/files/57748399749.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/fasikedegofeluko.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143776214254---85705365568.pdfIn PDF document text
    • http://csp.hu/editor_up/12841642423.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/kevugudevegi.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/72003341911.pdfIn PDF document text
    • 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_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 11220 bytes
SHA-256: 68d1fe6f14d6531ea6afc7d76e2cca673d17820862f555563fa18a021c23698e
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 19552 bytes
SHA-256: 5f397b7eca2e30aae82a6aeafda8bcea3b33ff589c8a52b560cfbdfdb9c02688
font_02_sfnt_off0001343f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1