Malicious PDF — malware analysis report

Static analysis result for SHA-256 8feb42e17372bc3f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 14:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2f17fbdea52531f05e68288c14f3651 SHA-1: ee2bfb8c71ce035067c48b5b7608164a671d1bdd SHA-256: 8feb42e17372bc3fff376fe6a98245650f5a98f6022939ef88a0a6466aa82f2a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users to these compromised sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607980a280cf0---73571531095.pdf In PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/41737771890.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/xinetoj.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0881d6fda4---50095461179.pdfIn PDF document text
    • http://chikatere.com/Upload/files/zivufuvotulorob.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0c551651f---3306796307.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/sasalolujuluvevogod.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/29536715818.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/94710204067.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b24d18cd5a1---43804921935.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/wijagugotabonelixipum.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/jojutiwowuratuxetiriporu.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/33855701953.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/livazejidarivifazito.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/zuxep.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/24726523319.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/50bab5e9209f409558da3fc67276a6da/legolarima.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/69025612347.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/toratixikurufesofirefives.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/zajisemememazizofigepef.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/raritibisuzozek.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/57857884213.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083acf9e6134---92608107056.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/bogaguwepupedugovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=micro+turbine+pdfPDF 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_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 10468 bytes
SHA-256: 5b54c2fdd8dfd5e8327e06b337b372db3c0fcd00694e5e1000de0a3c1fcedf8c
font_01_sfnt_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 18804 bytes
SHA-256: 6260c5cf00c4508f3df0d1eac07c693bebf9501e9412cda222b824472e913459
font_02_sfnt_off000125e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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