Malicious PDF — malware analysis report

Static analysis result for SHA-256 8121aeb852696bec…

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 03:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5687b29955a2952aa8213d198461357e SHA-1: 038f2fb108d169f3956a4a81526505737dc007cb SHA-256: 8121aeb852696bec39e03df87d3ff3d130c5206c0d231da409045db07d36b23d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several of these URLs point to compromised WordPress installations or disposable hosting, indicating a potential phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://queure.ru/uplcv?utm_term=meaning+of+the+word+creativity PDF link annotation
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cddc50ded4---98914239555.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/10959313571.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/xifibu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087c26bceb29---5769506638.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/11751316521.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/wevita.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/nojigurodutolodinefoxubon.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/67037019828.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab94f82220d---jowapawep.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/riwup.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/22114656338.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7ce7d7d67---89609307601.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/kosavatukumopasomowile.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/pedoda.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/pugevisodilijof.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210513142941.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/wajozexulenuxib.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/8d8bodv1n9kof8o5ofrr10e4r3/dubademozo.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/32826499598.pdfIn PDF document text
    • https://whitesal.com/data/images/file/9142_20210628004946.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/59337869520.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/610a47c365f99.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_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 10800 bytes
SHA-256: d7d331ea0c9a894ad8eee6322ea2d4b47b15ba1ab37cd8850f8c60a89b2e42be
font_02_sfnt_off00012637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12637 18032 bytes
SHA-256: a99be11008b20dba85971c7deb1301e6776d5b0f53da6215d42fd8901d3f0c05