Malicious PDF — malware analysis report

Static analysis result for SHA-256 3370a0bf2b5faa0f…

MALICIOUS

PDF

70.4 KB Created: 2021-10-01 06:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bb48e4e10d49c8ad03d226731e7c802f SHA-1: a9862a347a5aba5518b7615bda1df22b4517a3ce SHA-256: 3370a0bf2b5faa0f6f2fd088c2479b943225327f8d6b617e465bd6e37b787b7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or SEO spamming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript is a common vector for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • 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 http://chukguwang.com/files/fckeditor/file/65131820025.pdf In PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/fufewezewigat.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/58945787729.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/besinozeduwulen.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/govopopofojaxorojevox.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c2cd54b6b---deligetasav.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/13452150302.pdfIn PDF document text
    • https://satesayap.com/contents/files/pujiminamuzo.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/gojag.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152965251504---99623506594.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/65815630944.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/71176552633.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/vuferusonujupanukod.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/gusukegibodaser.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/bususexiroguzenek.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/45629625064.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416ab03e8b3---kunomefaliwowomekufevi.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/xiduguguditukasesigidebem.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/zusewewemifubeju.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/daxowalonukidofinotepigok.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/nidimifogi.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/74231503103.pdfIn PDF document text
    • http://dfzh.jmdftour.com/fckeditor/userimages/file/jojevem.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/55091939720.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/25278356599.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/vivet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=naruto+shippuden+ep+331PDF 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_off0000b378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 10744 bytes
SHA-256: e1989e3d0293bddee137308fe2eba9f0c9aa5cb7dc0f567191e8c670ee983e10
font_02_sfnt_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 14912 bytes
SHA-256: d0c4cd1cb1e17f5412e7843e7a8aa5d6eeddb83af110ee2a4d042f44c51e95c9

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