Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a97b72253285f4…

MALICIOUS

PDF

186.4 KB Created: 2021-07-05 10:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e52bcfc0946d71a78728ef8d4ef2d7e SHA-1: 455279797341fd43c049bca5ce19a7aa659200bf SHA-256: 97a97b72253285f48cbd27479aa73d5091ba3baa7a784672c4ab15f0139596da
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially to manipulate search engine rankings or to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://archism.ru/uplcv?utm_term=structuralist+literary+theory
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/47d4a5d0b38453e77b80889bae9d4b64/3408803057.pdf
    • https://nbcmedia.vn/ckfinder/userfiles/files/5536280516.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/5232076674.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0afe326eb---tibemikekewolazelu.pdf
    • http://bajcsidavidfoto.com/_user/file/15808209029.pdf
    • https://pjkconstruction.ca/images/file/reseripovabarojemurubetus.pdf
    • https://sieuviet.net/webroot/img/files/2649786521.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4736461450045de4f8134b98fc3d3315/96628456761.pdf
    • http://ducnhua.com/upload/files/xevesenigar.pdf
    • http://rudolphi.nu/userfiles/file/39836609671.pdf
    • http://kassa.pl/userfiles/file/46048477549.pdf
    • https://aravlicraft.com/cmsCart//upload/file/68768102407.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc73c1b0839---lelobotaxenolinonikem.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2a11d5771---kafabigodegeb.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/74afd65e89666b41f8ec6a160577aa26/vinomenasatuluxakupelun.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ibhbl32naobk00cbhc443fb7g7/92402933399.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608675e386ae4---kaxavoxu.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/616ed6236610be12ec613aba5fcb76fc/43770573422.pdf
    • http://portsreunion2021.com/clients/b/b1/b1889431de095b9710a1303a3c619afc/File/wuwowibejesap.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/oeqg1u9chv3dan795kknvsn2lh/45517546384.pdf
    • http://massarentearchitettura.com/userfiles/files/96217628204.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c13316ec53a---67744961410.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00027786.bin
20264f1c1031752dde22b3d6d922f47087545aa763dcd46cb6fbfb4c6397dfad
pdf-font-stream PDF embedded font (sfnt) at offset 0x27786 21904 bytes
font_01_sfnt_off0002abd7.bin
96400e9fa2c4ae491d6a385b5a74324fd543bb3217892c61f62885a112932be9
pdf-font-stream PDF embedded font (sfnt) at offset 0x2ABD7 10512 bytes
font_02_sfnt_off0002c3ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2C3EA 16792 bytes