Malicious PDF — malware analysis report

Static analysis result for SHA-256 181387ff8fa7d8dd…

MALICIOUS

PDF

110.2 KB Created: 2021-08-25 01:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac9af3f1c5fc0c0dacc3e264518dbaa1 SHA-1: 0e507509bf432233b067d827b7a1ac3c74e13f19 SHA-256: 181387ff8fa7d8dd038d2929883e2aec9712bad588e45a38796ff8f40cef6cce
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive link farm suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://cructi.ru/uplcv?utm_term=claiming+god%27s+promises+in+the+midst+of+the+storm PDF link annotation
    • http://brenno-tojestto.pl/userfiles/file/gikunokofatigesan.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/gitok.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/kopomem.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/56sp91mrvbouc99ioeed5tgb65/12477981715.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/75v89vg9lt74pa7oqk2li2vc61/39499578034.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611ac3591af1a---monamas.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1cft701uluv3ucreh0josd2vr4/76245380469.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1628282808.pdfIn PDF document text
    • http://fpole.ru/sadm_files/mapafemewegonoxeguwegaw.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/b861065e76c8e54aa8f7912dd0091da2/7775930849.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/95153805475.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/97196619558.pdfIn PDF document text
    • https://flyags.com/editorResources/file///62231018803.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f6aa18c9e---xadukisulajawaziwadofuxo.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9268c6f855---wokagumudezom.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2a0d29b0b---43186168977.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093ea18964ca---35660224598.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/metilopubimugupokudi.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c85ffa1ff5---goridavodig.pdfIn PDF document text
    • http://net-marketing.hu/images/files/rosedale.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/14548980239.pdfIn PDF document text
    • http://santabruna.cl/upload/file/84729487949.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/22722113627.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/mejepuzuba.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_off00014b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16381 16496 bytes
SHA-256: f9d891c51ea267fd2c6b9d780dfa12909908a9d654fb3172a71b78e4d5c50fce
font_02_sfnt_off00018e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E1E 11008 bytes
SHA-256: 28664e36ca148beb6ffde05eb2977f21a766e79691b80182c46726056880bd22