Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e832c3a4d334fef…

MALICIOUS

PDF

71.1 KB Created: 2021-09-21 04:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 786a0df3d8555b26de3b19f339a9a051 SHA-1: dd7ba06e24647c71bf3de81793a4a1c0f0c65e6e SHA-256: 5e832c3a4d334fef1d3ac9726df0397c751d06b96f61660bb2958b971564b603
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=karl+urban+in+thor+ragnarok PDF link annotation
    • http://designerhouse.ru/upload/files/58376680917.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/81646545073.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/79564955108.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/pixulogad.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/18755273778.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/54302985295.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/bekisusomiwuxolero.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413dc018cb2---48662697278.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/43517852915.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/81582328741.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f04331087defbe5d9e4e98da2805acc6/8800824297.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/sunevofosanaf.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/xijebamijaja.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/07/jusujixifabebugetopo.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/53652386882.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ku54m22imk6fi2if48enkfsdos/52580134810.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/5195838733.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/11375849477.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/18723364641.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/xifopa.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-03/images/files/xesoxusepes.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/wanajupimerovibifaxa.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_off0000b5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C4 16264 bytes
SHA-256: d28ddbd45c30390c0513c0042d3c7b9ced289077b0d87b11cb27634c51db6dd0
font_01_sfnt_off0000df37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 10408 bytes
SHA-256: a0e44c2b9292bb40a9429553e4aa3a9a6934a617f5620f60ea1f46999c78fbd1
font_02_sfnt_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1