Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeab9879535fda6a…

MALICIOUS

PDF

68.3 KB Created: 2021-10-02 09:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 57f785d157d04e031f416de646de3a96 SHA-1: c95e7ec22a48bbd87bc14c718aef22382937cca3 SHA-256: eeab9879535fda6a7f74af6189b33f6b6cd5ba5267a14b6b6431356a421a6b39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights the use of compromised WordPress upload storage, further supporting the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://santa.sg/images/users/00000000/files/kugeligarofelamusema.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/859288ki34trml0ubkfme0im91/fozavegat.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b3577edb---vutalomawidewakowez.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/84346203564.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/zanuja.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/bce326b984efdde995bbf71388d42b0a/dawilisinaliv.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/29973029151.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/59531318259.pdfIn PDF document text
    • http://apicn.net/upload/files/18896122572.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368cbd4ec95---ritomesokidavoteluw.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/mobamaxudafamamom.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/70981679236.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/2480f33007fac7f0bb7d6e6964035c06/29859835808.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/matitovunon.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/57873626773.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/45949698448.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/48053958733.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/lumawefajamubiko.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/wadilixelupimorevonumeniv.pdfIn PDF document text
    • https://ccenter.ro/userfiles/files/gakutafarofuzepilut.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/87128076526.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/82728144864.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109291304012748.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/karefizamoxalexeroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=2nd+quarter+resultsPDF 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_off0000af72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF72 10296 bytes
SHA-256: f3d0bbc22eabca5c566647fb611f4b925f84ae8b472eb2f7899c4e3f7c2c5b77
font_01_sfnt_off0000c697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC697 14856 bytes
SHA-256: d51853402fa6c775ce10400e2ffba016afb34b6c0048814f38c02a3ccbe85bc1
font_02_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1