Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ff26997ab1fdc7…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 01:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 36d604634e1066ec0dfc69b213123c09 SHA-1: 6acc1d75d1e2091a830aad884670df1c717d8a58 SHA-256: e7ff26997ab1fdc75bb14214bcb025a8fc7e83404b4255ec3b2c54674b0a0bb4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ad26e32cc6ebbfb02269f427aa05e272/nuzenanitaxewoxef.pdf In PDF document text
    • https://la-klamm.org/Files/files/78266304009.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/13715232656.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/vamakosijovokizitido.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/78974684716.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/9842576470.pdfIn PDF document text
    • https://istanajp.com/contents/files/mitatexasezesefu.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/kugibuvuzawujusunulixoma.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/sukizigetenetowuweteti.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b4e553e53c47061c405062445f4d7405/98560075073.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/venulikerexasugav.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e14260233---16393047190.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/73454477636.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210901_B20F22408FC50794.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/xupividar.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109101605449299.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/42041312999.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/26691660748.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16134d73df2270---lutapivaximufirixilolix.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109110427106867.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/lizowipubugatobizel.pdfIn PDF document text
    • http://interstudy.net/userfiles/file/29329769597.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/3920401383.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/53304462142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=list+of+words+that+start+with+rPDF 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_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 10212 bytes
SHA-256: 88da9de3e65609915d16211f4475d83758c3c1e50a636ff326d1895bb93ab7e2
font_02_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 18204 bytes
SHA-256: 02d80aa6221839d0e4ebb519de1b5108d76e8de9e64866933bdeb35714179313