Malicious PDF — malware analysis report

Static analysis result for SHA-256 837eeead0501c707…

MALICIOUS

PDF

96.4 KB Created: 2021-09-14 07:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9bb455357a78a2044f977540c0ee35b6 SHA-1: e601766742f99c2ed9731bb90fead164355a7b0f SHA-256: 837eeead0501c707d5c17e31198a7095d3321cf2a574c19ccba25dd9d343a404
236 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a remote support lure and a password-protected archive lure. The ML classifier strongly flagged the document as malicious. The embedded URLs and link farms suggest an attempt to direct the user to malicious content or download sites, likely to facilitate further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://stluciachamber.org/uploadedImages/contentImg/file/67545958186.pdf In PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b5984460fb2ab1abd2281e722ede4da6/lutinapa.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/29615013250.pdfIn PDF document text
    • https://dhesient.com/media/50324698075.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/58024008705.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/64743309254.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/raxonore.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea5c3d0c9---kopujagajewez.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/fawip.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/saludewez.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/nugux.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/dizivonukijobu.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/nipomibebokutir.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/xexazogekowizeluzalu.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/87575107224.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/pizomomewotodokipabivave.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/44476684743.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/bnbj0okbu6eqjh271c5dftrss6/18488989926.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/bokana.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/21754277476.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210903071737.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/75296574508.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/pimoxapigurubog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=controllare+un+telefono+android+da+remotoPDF 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_off000114e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 17804 bytes
SHA-256: 8e62d7e9ea3f103b5eb8f79f78b9a860f535cd30904429ccbcca293fecd95705
font_01_sfnt_off00014371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B88 10476 bytes
SHA-256: c52e89ba39d386282ec01617f4a787b812c813d5c7b79090bd4dcb926853edef