Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aed09f719a70e16…

MALICIOUS

PDF

93.0 KB Created: 2021-06-19 22:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: df689261f4807ba531b29140e3d3cc49 SHA-1: 3cef1c3952d61946acd2abf8b74a5a908188c26e SHA-256: 7aed09f719a70e16d7e2a09ee8dfd2f8da42dfb5407ec53d5ac0a5cbb2454d53
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous embedded links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://banglatalkies.com/dynamic-images/cms/file/47008005115.pdf In PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083655869798---13018421355.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/dd233063f35971f5cfa8b45fdb801dba/mizagezawiwozo.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6fp5tcsc06qekqqn4k0vt5at5h/80227572115.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/38df46dcca37baffad99b9c1d2bd0838/87680295440.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa05eb72dc---pobofokufejaranosimolo.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105270219598770.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/30248443181.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/43796180027.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/80148178819.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/0d095f0cb18b624285546fcd97130950/33023271572.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832bf0b22fa---lumajabetoduruziruxazawab.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%252Ffile/10695456156.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/rp2gbs6ksctik3nktuo6ujbovr/8545122973.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=if+a+line+is+tangent+to+a+circle+then+it+isPDF 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://scripts.sil.org/OFLIn 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_off000112d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 5080 bytes
SHA-256: 08889f7675877505d9cefcbd3a8e519b93d642c5e6fdd9ae5db72edc8a3f82b3
font_01_sfnt_off0001241a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241A 12612 bytes
SHA-256: 1ba1ccda6af9df33bfc4d4c00e205fa11582fff82e8e5c297ec9f267cf869172
font_02_sfnt_off00014f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F83 16172 bytes
SHA-256: a7b6293d4be41d5c6e5495b0da3b027e914fabda6c18c7e79a5b07ffd060f8e9

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