Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eae3530e19fbacd…

MALICIOUS

PDF

78.7 KB Created: 2021-07-20 11:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 108839ea5c073ead60c6b034659ab858 SHA-1: f13f92f56d7c2dcc0ac8c6109ffe3fcbb49949b3 SHA-256: 7eae3530e19fbacdbe496a137ac96f427c4fdcccb9db0db557abb4bbdf60a6bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as lures to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://dichvumayphoto.vn/webroot/img/files/62669563428.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40422b9f03---xoginexebawikidif.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5b23d5e1f265812c259f69828c51a870/melimigixumu.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095c8333a2c4---1256117501.pdf
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/69124013131.pdf
    • https://bisnismedsos.com/userfiles/file/sedodapokasib.pdf
    • http://marthomaiticherukole.com/userfiles/file/nifewasojebipageki.pdf
    • https://samarpanbharat.org/trila/userfiles/file/35478150556.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d020e00651---nanurusewodonebalokig.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e0772ae1f---48147694216.pdf
    • http://sattamatkapatti.com/userfiles/file/rujiwirosek.pdf
    • http://rbc-bezorgdiensten.nl/upload/zutufuwoderow.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/j07hmvoacoa2mv7trabkrj2og4/wapife.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/6332c25e603e7be03a509b401c9931d1/diwolaguzixotulavawedefe.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/90sc8m61gfo2h3ssp28bcfvfhn/kibazapikezad.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da68793fc7---dabusemotakupokitijudes.pdf
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/xodipabut.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2be3c96e34---12592980785.pdf
    • http://blueyee.com/upload/file/250745103668.pdf
    • http://medica-brno.com/files/930534856.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607624e195781---45914299132.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/ruvivurakeratorejenuxed.pdf
    • http://nedirajtebosnu.net/userfiles/file/47096291453.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+jerome+biblical+commentary+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cecc.bin
2b53bfd52214cceee0897ddfee0d7f4b83f8033f174faef47050fd53b5433c8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCECC 11064 bytes
font_01_sfnt_off0000e81f.bin
beb40dc1410b38480ea106e5f557a08cffc343c3014ee024138f6fa40d914c73
pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 17240 bytes
font_02_sfnt_off0001159b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1159B 16792 bytes