Malicious PDF — malware analysis report

Static analysis result for SHA-256 087575bcb50e6c40…

MALICIOUS

PDF

102.8 KB Created: 2021-07-29 23:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d8358472c9ae42a8f80c35029476b7e5 SHA-1: a58bc485fdf24d6aa66404c5080c47c3a9301246 SHA-256: 087575bcb50e6c409c104dc02326cb4ba8d60a28e2a70cb1debb805d3b13cd5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards an attempt to lure users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=pathogenicity+of+fasciola+hepatica+pdf PDF link annotation
    • http://ruresept.ru/files/file/34826405789.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16093cf2670404---26070834661.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/d7a406a1fb55a975244b7cf075e81120/mifopokef.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/89667553331.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/wivemopefevizidigibek.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc7149ad5a---folobogoxititot.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/cfb7242a783e4bbc8256406a75fd25dc/42637316063.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160892667d5c6b---wivug.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/af7d1f72cfb9ea1c40ed2c7106b1c746/ruduvafonupofevoviz.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/eleb0tn9h1bmc7ueluj5cphvp5/bewixifumugojusim.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b80022ef8---niforuvejezajonod.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/j7pj2rq0svvb4g7johj5kpv00b/79195477151.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/pegux.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/37271335853.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/gakuso.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/75160687842.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/78087528809.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e374149de7a---kagukon.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608773bade386---93733518510.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fc63cb50340---mujudadazigumiruti.pdfIn PDF document text
    • http://didopack.com/files/26598496807.pdfIn PDF document text
    • https://faceless.me/userfiles/files/46493380689.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab48f4297c3---wofijarezos.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/87737950815.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_off00012c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14472 10916 bytes
SHA-256: 378a307bd295a00370c59dfff141a82391f0b6ed46546eadde879a3897f4a5b2
font_02_sfnt_off00015d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D84 18176 bytes
SHA-256: eb6c186c8e2e2211cf33ebc262dd6dc1045262e75432b1d59d3c7e9b48a63db0