Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d1ec829fb9c22b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 21:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03eff003a52abbe25c2c77f8caedffc3 SHA-1: f75e080502cba0896f8fcfe4ed58efd830ed8f32 SHA-256: e8d1ec829fb9c22b033dde7aef51165b2946820f4295a2538c01b2a89529de73
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a12915d0e4---60570110137.pdf In PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/vaxalokunevutixelewuji.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/vatifi.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/misamedilajixajaler.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/63c398ae8500d99251a20bf6b3e6857f/xakubovite.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210623224600.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/59527341307.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/pagesaxomuzafe.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/24600078903.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/62028485044.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/9f1881e63fe2bcccf1a4fbf2066622d7/piwotevivawax.pdfIn PDF document text
    • http://camelliafb.com/uploads//files/202108110737187531.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/zagujujirodajexuraxajotik.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/19268117948.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/20323534604.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/risukixofe.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2661fa6d2a338bc5bb75e94dd5c273c1/dafumofek.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ngb1b0upj5odjbfcoijt2b0aro/13412849378.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/karepalonuvotisinipowam.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebd35993f9---pirejuruboveris.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/moketul.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/bndk8i99shknuu2gjr9nr7ov34/jukonemamuromivigivutizi.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/vesimemel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=english+alphabet+worksheets+eslPDF 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_off0000cf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 17532 bytes
SHA-256: c515e7018874a3d78be1ff49ad68726f0537da970229f71d69f6af82daca3640
font_02_sfnt_off000114a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A1 10832 bytes
SHA-256: 67f23ceb82b1668ed5ba326a3c8f87d1450e01d36be74d943494b15fc8a285f8