Malicious PDF — malware analysis report

Static analysis result for SHA-256 930f1814c78c4e71…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 08:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: acad2a2b046eebd9f7b80e49ece446aa SHA-1: 1890e55b60e97c25be2c208cc20650b5ba6b123c SHA-256: 930f1814c78c4e71fb8e7505af20d59883d9663136c02fc1af3c2c419c1ebf42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the true destination or leverage compromised infrastructure. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://minipowerpack.net/upload/files/64075968625.pdf In PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/60915201686.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/wigabumawoporug.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/nutuzikebegir.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/femejugomitixinefal.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/tozuperiwudoj.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/sejipoxapoteranabubosa.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/51444095143.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecebd99fb8---powefizedovaguxavufafuj.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/14794048769.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/peteloxelijezikunu.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/20177366871.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/baxudos.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/duxinadesuvi.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/3331130470.pdfIn PDF document text
    • http://topflexsports.com/uploads/fedugotivizafuk.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/zususi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e470acfa33---22686996127.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/19202147798.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/28256928840.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/57423271898.pdfIn PDF document text
    • https://keongracun.org/contents/files/koliwodixofisijekovoniw.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/86896037911.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135a6b06fcaf---wevagejema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mobile+droid+apkPDF 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_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 18932 bytes
SHA-256: ea62153098e418bb9c401c3b71d75191c0d49b88ee22299654f9e42ad5483b44
font_01_sfnt_off00011442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C59 10240 bytes
SHA-256: dad4cb2338858ae7c5d4c0c25211f696283ecd510185ee42ae7e3ed1ba795f9b

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