Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac102137702080a8…

MALICIOUS

PDF

74.5 KB Created: 2021-09-14 13:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 151bd410f65eae5b7a361d9fe52bbeab SHA-1: de4fa676ad222c53959ee84c6f50200bfcab1a39 SHA-256: ac102137702080a85056416d97d3a8315fbb0b7746ee2caa9249cde84a548295
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, utilizing compromised CMS uploads and disposable hosting to redirect users. The embedded URLs, such as the one pointing to compromised WordPress uploads, are key indicators of this malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/2oitld3o3g2ngl51spa99jnoqm/bezazedekiwenolinamorixed.pdf In PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091410373173499.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/50949227936.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/3694921146.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/76128175531.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/nisifirarewi.pdfIn PDF document text
    • https://sainaudit.mn/File/79938364544.pdfIn PDF document text
    • https://amgaa.org/temp/files/mujuvi.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/lowizejukapot.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/g6thjjg086v1fuig8qsq762bv7/lazanosinonosika.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/fowoxefisinuniwa.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/52058873393.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/fezuwivugofi.pdfIn PDF document text
    • http://aven.su/userfiles/file/10976491415.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/38040495304.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/4247325190.pdfIn PDF document text
    • http://htwy.com/upload/file/bajusadowonav.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/pagisebawipijozanejudo.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/84833781679.pdfIn PDF document text
    • http://laserinnsbruck.com/static/pipefofudelag.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4ca649a5---fonijabaxoso.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/31956732505.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/roralubimegodibewajim.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/3168159240.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161342403ad136---tiwetalekoxu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7b8f3fb11---gofiranebadeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+sync+from+one+phone+to+anotherPDF 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_off0000c168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC168 16192 bytes
SHA-256: f1fd29397f0b044b4e75ec75f8778920a52d15dcab0f81b5af1ba1f21722954d
font_01_sfnt_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 10796 bytes
SHA-256: db05ff423c8cad1f3893678deaaa0622f5a62cc13da19eb94a234c6647c02aad
font_02_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1