Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52d5db8273a70bb…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 01:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a13925aeb67e04c37da16a166640a766 SHA-1: c16f92d4949e20a1df376cd24584d70c96d2d5aa SHA-256: d52d5db8273a70bb85af030a3a7be5aed85e3982e41c066614a5e4b7cab20722
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress sites or disposable domains. This structure is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 http://aostavet.it/userfiles/files/43244715085.pdf In PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/015c1bff0085f20f280e505ba379617e/35357449866.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56cc6b3bcc---vijekuwanavas.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd305bcf34---89995146056.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1626121281182819059.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/53979881701.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/40910833595.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/bejoxipoviwipizax.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/nobunagilike.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/86034610380.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/e48bcb39891a4dc61093d44da93b26ae/baworu.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/padivemuverusikigufomut.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/p9b16ot0g7ctfprv84c19lmj66/56318258896.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/51816319171.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/kodupazuzawul.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/bebanegobugokukobosobavu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d308d5ca1c---dajizivis.pdfIn PDF document text
    • https://filetorme.com/upload/files/52333875983.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/zabopasefifu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5da1b701b608bdfd2ab61350c4581288/90918185385.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/12bb224644516750a4d68653700dd350/wavewalurewuxokedajipo.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/relapomiramavaraxipu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/e0vu6s096aoupfime8rj30phai/10445161546.pdfIn PDF document text
    • https://langumeistras.lt/i/File/57853240334.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/a8715adf66f160099af22b7cc2ee2baf/xumewuxuloref.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/55638964730.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2e424f210---37406031151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=metal+element+personalityPDF 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_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 10520 bytes
SHA-256: 5229880f935e1875bec38e97038caa6dd13a77872993b69f7191137f4800c476
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 16652 bytes
SHA-256: 57812ec3aded0bd7e4741311ef46b282ff42b771d4c086870106c2ddadebd226
font_02_sfnt_off00012823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1