Malicious PDF — malware analysis report

Static analysis result for SHA-256 12821eeecd23ae0f…

MALICIOUS

PDF

88.1 KB Created: 2021-09-16 12:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 006ef59f1d879753c9ee60d1c8dda886 SHA-1: 3d99a83427529e4c30b3f6ea4bfbc254e8ff54b9 SHA-256: 12821eeecd23ae0f9846d7d524e697b9c53e96e62ce294c03e9883fd24cac169
156 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to a multitude of external websites. Several of these links point to compromised CMS upload storage, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://egf.tw/test2/images/file/62849349779.pdf In PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/mawojeravuxev.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330f8becc4a---65733414662.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/95424297825.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/84449300033.pdfIn PDF document text
    • http://mamam.by/upload/File/file/vugulorelujet.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/bf5c95c7be2714152437e5688a49d8fa/66936919859.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630650594.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b0f939a9c---dajaralozimaga.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/34289016600.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/47471728629.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/97807477218.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/xosojojuwezarusokeb.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f196a28d68---59575890579.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/14400401751.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4eqh5gmuudlsste3ojd9m0ke4j/11142795448.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/bevabebinew.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/xejodiditubepigaxinojo.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/89177024117.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/93138943260.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/70314385877.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/sesulubujix.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/jalq59nhplb3fr2r4r5vb94n8u/96824277543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+device+id+for+push+notification+in+androidPDF 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_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 18700 bytes
SHA-256: 07e2e43b1a56c2edd7d22640cd4aa1b59e21aea0739982fd54ce8ab0ba8b8710
font_01_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 11096 bytes
SHA-256: 8dc6f4e272c23078f36644aee8cbce6b2503085da627224f1c7bf41bc2a5d148
font_02_sfnt_off00013a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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