Malicious PDF — malware analysis report

Static analysis result for SHA-256 1733edf106a7dfdb…

MALICIOUS

PDF

95.1 KB Created: 2021-08-13 07:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6da2d7002d80cc9e3a488ea80ad6c5ec SHA-1: 448fdbc583f334de175b13c0cdd9e44817235c36 SHA-256: 1733edf106a7dfdb5795b242b5821e8f469ee7543793ca63565ec4eafaba420d
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, 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 document's structure as a link farm suggests it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://guides2alpes.org/uploads/file/47935523218.pdf In PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/52f654dd245fc9f500931cbae6e2ef6a/9057830521.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1f3668ea3afe5c90e07fece0b8a3000a/memuzizoju.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/wiwafijajevabijetik.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd35c150c---95265504214.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a293552d1c9---79448349181.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a39c9796ea089a3c27cff1a73e25daee/49579488256.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/lusorujawolunaxozurarokod.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/487c746f71aaca7214141353db64d761/28139671301.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07f804d9c---25381504209.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b46aaff34---zabexuxaxajenewagujel.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/22366146213.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/wilexajezek.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rewatujusebavumofamazesi.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/6db2466b81199c8e3c863eb4c07000ab/40452842093.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/xijanadujojusiramanufolek.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/lawales.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/nuwovibuxatotufabavuw.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/ceb96f7dbd11304d55c5e1952c1aa157/39512337314.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/78743553103.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/ea9d6ff8340473ea2a7c79eef68cabca/40213208442.pdfIn PDF document text
    • http://homeopathyhongkong.com/files/38273148542.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/refobasoravawozuv.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/13099106371.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/redefukerevafoluvasin.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/97b81b69dc5ff46170ad0544e72a0a9c/84367914431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=amortization+schedule+template+excelPDF 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_off00010ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 17444 bytes
SHA-256: f6c95a99ee88e4330ef29f02069afcf7ba11430374d423b1708a5f3549c7f053
font_01_sfnt_off00013c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C43 11024 bytes
SHA-256: 6bd2daf84bfa41dcd0da69e99eacd1fe58273ccf90efff7c29378d6122c3dd33
font_02_sfnt_off000155bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1