Malicious PDF — malware analysis report

Static analysis result for SHA-256 199059baeedd4ea4…

MALICIOUS

PDF

69.4 KB Created: 2021-10-07 09:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 51f6d3a477e4a602ef79816e44999842 SHA-1: 1d2ca4ceb86f6cccd6f21ec8c1d8d258baa94862 SHA-256: 199059baeedd4ea4b8939cff9d44c0525897a3850c4bd87c8eb12a12b806de3a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=arts+and+crafts+festival+2020 PDF link annotation
    • http://skipjackpoke.com/ckfinder/userfiles/files/vipufawozorego.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631581383.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/runuzaluwari.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16156e9d05da2a---83006414985.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/dumilinajade.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/miwafomofifekoxewu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d9ac13f189---varirodob.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/70881672490.pdfIn PDF document text
    • https://panoramabyty.cz/content/97360057546.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/17331858435.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/daputiwomibazikat.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/xotuwosedidojoxif.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/sogupofugawazufi.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/fuvosuza.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-10-1/20211001111450196308.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161556ffcdf80b---22376988131.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/rp95u4l88nvr0jcvcfvfpr9tpc/65304073568.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/17612294038.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/14900798754.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3cca91b9bb2f538dc235a92e3efb2446/5679619581.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/81086877190.pdfIn PDF document text
    • 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_off0000b19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AE 15212 bytes
SHA-256: 88959896508f45c8141eae2b695a61aa3f2c787c4c5704ea90aa82413f3ca383
font_02_sfnt_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 10636 bytes
SHA-256: 55e0b2729c30982155fbc6270138766a526f5cccc25f578e74dc89d8cbeb29c7