Malicious PDF — malware analysis report

Static analysis result for SHA-256 323ae6adc6c82525…

MALICIOUS

PDF

79.4 KB Created: 2021-09-10 04:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5b382c44ba794dc48123bb1639377f3 SHA-1: 80f44223277319067826d976ac1dcf120183d74f SHA-256: 323ae6adc6c82525ee48e980bcf3541022f160fc8a45aebc833b96011f79aa69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The document body is unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://materialdeestudo.top/userfiles/files/sidozonusopag.pdf In PDF document text
    • https://bravo-hk.com/userfiles/file/gakedaxupefifikelum.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/61042246276.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/21294430263.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/97734171195.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/tajoxisotukekiwu.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/galatotiderurekazafi.pdfIn PDF document text
    • http://teakdeck.pl/files/file/90210107667.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/32237638098.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/i3dvanub9an3qu3fs84flh4pv0/49502971130.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/nujaxopuzejasobi.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/xibokewe.pdfIn PDF document text
    • http://acelybio.com/upload/files/kutexerozolijaseveped.pdfIn PDF document text
    • https://clinicscrm.com/img/files/sizawubafifedalakok.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/87890189814.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lrac0mmt067c1l911suj9mn7tj/48357767538.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/24009541145.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/93909930141.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/93357805547.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161397b6d134bb---vosivufajesoted.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/56149814909.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/tixewuxumezomexarivo.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/44671026697.pdfIn PDF document text
    • http://orlickachata.cz/files/files/kegalowujiwejokudajasuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+studio+linux+ubuntuPDF 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_off0000d319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD319 10272 bytes
SHA-256: 96a5bcf5a69f33515ae80be37030283ca1973779c77039725ac0b740f368b0e1
font_01_sfnt_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 17604 bytes
SHA-256: becdcd36fe1165bbeff41ae545fb1e591ff7af6a14010cea6dd02c33cade73b6
font_02_sfnt_off00011827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1