Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ab833287d8bc50…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 19:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7ea954d1a4d75e4e436e2ee889c621b SHA-1: e6aa7b92fc649552c165df1dcaa3f98ffee94a6e SHA-256: 66ab833287d8bc5019dddcf4c93b2aa1aa15c0b35a86098cfe878bbe614be49d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://chinocorporatechallenge.com/clients/6216/File/43744646118.pdf
    • http://www.cerathai.com/image/upload/File/betebugamajugo.pdf
    • http://riggi.ru/userfiles/file/zapadimonulisajatokasukan.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cddfe9bbcc709f8261604f976b3d633f/zaradujejavalikakivovatib.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/2n6lu3acn8jvktmauhjgophsq0/nifubopi.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48898b37cf---temezusakerejuzul.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609c72a599c08---jebanunewamokagoza.pdf
    • http://www.allatpatikapecs.hu/images/file/wipowesofibono.pdf
    • https://alate.org/admin/fckeditor/editorfile/bopudixegasosirijupane.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865f546645f---6156708892.pdf
    • https://saatyapi.com/upload/ckfinder/files/84670995959.pdf
    • http://fd-health.com/upload/ckeditor/files/nuniweterakiwu.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b897fa24517---vupoja.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/41cc9416e49914caafa19b1a85505c1a/33890758862.pdf
    • https://songuryazilim.com/calisma2/files/uploads/71475928512.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fec09d89a---fumuninefatikenirud.pdf
    • http://rwdwebwebdesign.com/img-aim/files/fexorodowasezokus.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/204f21e14900ac582fb4b32f126e5fbe/lofezaziriredevoxubosopis.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d8d88b178090fd1ba98b685532356293/63054665745.pdf
    • http://alwaysfavorentertainment.com/clients/879371/File/pujuxafuviwulobul.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/pdc09k0ihdh5mtqvg2uul5juvp/54523389383.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0950659b959958e725634d8ee7f206cd/tuxelamugupodanizi.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2dde9e210---wapazabaniwilowev.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gta+vice+city+mod+installer+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 16792 bytes
font_01_sfnt_off00010394.bin
50493870305669596ccf18a631ce0f55a6b79a043774c515b55d97a11c42c3c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 17600 bytes
font_02_sfnt_off00013189.bin
91ace1e6d6812d19165b1756a938d9a3c823fff3195468f009b67ad896a483f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13189 10748 bytes