Malicious PDF — malware analysis report

Static analysis result for SHA-256 f551480e8ae7c650…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 07:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7408c44277092804d0e636a50ec15c7b SHA-1: ec1b27800200f40295249623e0fff47595415a61 SHA-256: f551480e8ae7c6505a077f7a5b5addfdf2c1dfe7c50103e696e05aea98000c86
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be disposable hosting or compromised CMS uploads, suggesting a link farm or redirection scheme. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides a password to decrypt a subsequent payload, a common tactic to evade gateway scanning. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://www.db-ynox.fr/ckfinder/userfiles/files/33997194047.pdf In PDF document text
    • http://hmondo.com/userData/board/file/jafutikebuzelamu.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/61866194258.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/3957206279.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/rekesojew.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cc0800dd8---vufanogibuvi.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/22717046353.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/77147294786.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/jewegavem.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-30/20210730020405962586.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece1970e24---78587277534.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/46320451658.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb8a1327e---28927546376.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/todirujemupunobonubat.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/ligolirudipa.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/lewuwapokiva.pdfIn PDF document text
    • http://darstin.com/userfiles/files/wuwuwifegudoja.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vipezimilamapoxa.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/77898259096.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/nawulaminotufowewaj.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/67417704250.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/sabujaxokumapirexe.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/1938744665.pdfIn PDF document text
    • http://servmed.net/userfiles/file/sulitilasoj.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/dufalofebedofabufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=free+locked+pdf+to+word+converterPDF 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_off0000bff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF5 10412 bytes
SHA-256: 4e3715c22853162858cc4d5de928188c96ef6f24f64ad733a700c14068552e1a
font_01_sfnt_off0000d7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AF 16700 bytes
SHA-256: 544323a4cc47b213c79fef64afdd544e44c4bec478d4f72096799726f31afcb9
font_02_sfnt_off00010252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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