Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a96e1707edee4b…

MALICIOUS

PDF

92.0 KB Created: 2021-06-30 02:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 20674f0c6e8144d955dda61d861b4d48 SHA-1: 84648624ebe201d0ab33ddcd4d304c6b0b4fb3da SHA-256: 25a96e1707edee4bf9d3a18ad852ddeb2ebb4fad6721070e1a8f7f89567fc617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users. Heuristics suggest it's a link farm on disposable hosting and points to compromised CMS upload storage. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/ce6a2b57af945b28706d05cc823cc2cc/torozodu.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/4kqh41457em82d9qa8vc12ec7u/wilopezipovis.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4e05d866c---52199432775.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/danewukidanuge.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7972638b7---sigomivisotu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16af419dcf---nisesulidinasawex.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/fowigamovewejolitalabowa.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/47954699775.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0f89950a1f7a1d01fb12c0c2d0d59917/sodimizadomagorapixaw.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/6393064406.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021061718081390.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086e318ca15a---motemitadijezifi.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/97737857740.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/1dpdpgecdnkh7l3p5acq9rnf62/resamefikowabosujajure.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/272eaecd95c1508484e665e521fcd988/92085759850.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62a6ea448c---wokowosifojafupew.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716e6695df5---70931714300.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8e9e2acc755632cf44647af677820dd4/5907699439.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981f83b7b4c---55460108425.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160748a2b4a653---48607155450.pdfIn PDF document text
    • http://beiks.info/public/file/15788441252.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/jofoxetafovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=from+pound+to+shekelPDF 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_off0001069f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069F 10572 bytes
SHA-256: 01946a57114082a2a8b028196e69d0237f90e4881e2bd2cb3542992bb1a51e4f
font_01_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001369f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369F 16700 bytes
SHA-256: 9686690965cac52b4d5e1af887f7c6435ad5f2bd01a6385b7740fd218c509de4

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