Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7aa6b55ac97b195…

MALICIOUS

PDF

71.9 KB Created: 2021-09-24 22:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a89e3ec63b0b68c6cf19dcca3d496070 SHA-1: 54ab9c84444cd145afef9addb62ce1dffc04b5e8 SHA-256: e7aa6b55ac97b1951fcb080d6ffdcfbde7cc23dd959f5302f0d451b60076d3ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing and malware distribution. Heuristics indicate these links point to compromised CMS uploads and disposable hosting, suggesting a deliberate effort to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://coretry.ru/uplcv?utm_term=gothere+sg+android+apk PDF link annotation
    • https://tiemhoahaibara.com/data/dulieu/files/zigaxomezelat.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/kugujenizarowavikozoxupil.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/fewowojema.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/boej34rbim5er35kouk9tdiemf/midojeravufadonepes.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/07e75e17c10e2148a4693f9f761eb384/85082391660.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/piralovemogidojev.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/24116249265.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/xugarapus.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/51856841538.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/84251570832.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/93517641537.pdfIn PDF document text
    • http://fruitvita.com/files/files/14666255617.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/21833242072.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/6145676016.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/wepinutinarazun.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd2020d472---62892304998.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/voxifikotes.pdfIn PDF document text
    • https://pmms-online.com/assets/file/feliwogifedofotivagobadi.pdfIn PDF document text
    • http://unseretochter.ch/images/file/kujal.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/66228796983.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/23508222191.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/morisadikigexo.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/90644950726.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/jogivopazelowofesutumi.pdfIn PDF document text
    • http://imaginove.eu/data/Files/43506193162.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/nufasowetutidowi.pdfIn PDF document text
    • 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_off0000b62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62A 10756 bytes
SHA-256: e8f2db6b86a5bc5e041ce26283566aabd4c60626cc756dbd77e94e530491f761
font_01_sfnt_off0000ceb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB5 17204 bytes
SHA-256: 2e96a1ae13eca6caec1ec2b3c9865de9d9048fa74e05ac674a46493826ffbfe2
font_02_sfnt_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1