Malicious PDF — malware analysis report

Static analysis result for SHA-256 895d39d5ff4fff1f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 03:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4fe55a85ba31083b5f8983529295961 SHA-1: 034f5b13a9de308a2c4f466166e33a9bf71335e8 SHA-256: 895d39d5ff4fff1fa2d2a087aefd7df22ffcd991aa4c067b05a0e39677947d68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure suggests a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://wastran.ru/uplcv?utm_term=just+the+three+of+us+full+movie+2016+free PDF link annotation
    • http://phutungtdc.com/upload/files/ribumapinoxelovale.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/94871781193.pdfIn PDF document text
    • https://zzwgjx.com/d/files/39085104559.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/37127938635.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/21024426897.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/6796476913.pdfIn PDF document text
    • http://zenithmetals.com/files/80088175635.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109011751059480.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/tavirujokufex.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/sunasevi.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/1954522975.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16133281050078---92129796480.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/jemon.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/44663282352.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/dukurivili.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161333ad37eb1e---93941676311.pdfIn PDF document text
    • http://travellerisland.com/files/tewujexobuduteza.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/18733800469.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/30944139245.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/9454247615.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/49757409800.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/revadavejapurimon.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/18360736816.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/42299329129.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb145a7943---68083883816.pdfIn PDF document text
    • http://vuason.vn/upload/files/viras.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_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 19036 bytes
SHA-256: 62fa3484d8af2ce5c433a1ea8d696414c8fa51a91b000fe55b96bbafe35296e7
font_01_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D90 10832 bytes
SHA-256: 921533723b431923bc10bbba60ecbb318fe1299cf89a29ae937971969e7b90c8