Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3bf52bd02ef0ba…

MALICIOUS

PDF

85.8 KB Created: 2021-08-19 19:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d0f8996d399c2d1421f3fa01fc9b4f0 SHA-1: c1dae48ec035e4c0c89eb6b2c0ef918413b59286 SHA-256: 5b3bf52bd02ef0ba975725d3dcc95611b0b55c5c2fdd9cacd669fe9faa4422c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. These URLs are designed to lure users into downloading further malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/6fbec4beae18f8e6cadd6895a41a6db3/65208918822.pdf In PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/ce603fa50662b16c341999174e7c2ed6/73260405904.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608070d1c5a93---pawapirugelegisuzivezaru.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/59700721022.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/a2fc94f3a763c23842789099a1e01d94/3242727429.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/xelesadorapu.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/27333438250.pdfIn PDF document text
    • http://coffee33.ru/archive/file/zukilawenijarurizogezib.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a684c2d727b---57623562590.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/1s09vsue5g84t96u9716e0qsb2/64027192703.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6c239dc578c745ee841f54f586e89286/zipokifigi.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/gerobaxifelago.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/25421025767.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/81380501279.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/69132439139.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/77277199555.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/sonifofupagitetodul.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/64265681052.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161176f1b79fec---somazanoxipamokugozolo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7040d426d---palututixiramusevaxikug.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/7569399041.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/xupaselumuxexujawum.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/883710b55244db4baf584f89fc5224c0/20003330665.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/16904065529.pdfIn PDF document text
    • http://atek-ent.com/upload/file/kirugikolomifubexuwimorom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fb+download+apk+for+iosPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0359dd703d7309620b4315633c48fe83/34817991986.pdfIn PDF document text
    • 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_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 16672 bytes
SHA-256: f287c8066620264734fde0607fed8b0c20a6ca42bfbfb10e68af7997551a75ba
font_02_sfnt_off000130f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 10556 bytes
SHA-256: c42972f4f6076f67b876f53b66b91a7b107bd68bf186e7aecd6ed6e1a08d51b7

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