Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a5eac47c6a9c6b…

MALICIOUS

PDF

83.9 KB Created: 2021-07-14 08:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2330cb17dc376c03de9b9e8496f60baf SHA-1: 75cf0ab26b104bdd708002fde673387f585e9cfb SHA-256: 05a5eac47c6a9c6b76015118ea5ddb0fe04aac70dc7ce248b748aaffc2731288
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly indicate a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=mbit+and+mbps PDF link annotation
    • http://orgue-chantepie.info/FCKeditor/upload/file/69623697591.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/3167664001.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16092c3fba771f---52481685.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/raxekuj.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///bewesujeralugemamu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e96adc46f778c7c6aa3fbf0cdfc8cf29/fatozerorude.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d6983ffb---rikesonunateg.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/b1spf15elkk9hdb0cdtk8ck590/1043561080.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2d74dd9f5870cb100ca63479ab1a2da7/55800774486.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/renuzaxorofob.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/86012641556.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/metotad.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce49854903---gidefajivapovipef.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/48881096191.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/fupez.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2a2j51uthi6u29gt7bsbl5h7t5/labaratemu.pdfIn PDF document text
    • http://nfc.soo.jp/file/jodoxipasuvowebe.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4bee2834a6775dc1ad6737f8b89ff69a/90125448431.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8bf2da1e9d91d41a418e397522a22d32/2132026823.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/91724f4945c3255247dbb327e0406542/rajivonawirudosa.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/f6b215b64ef6ce20d1f9ac8a2827b8b7/60521173533.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_off0000e574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 17968 bytes
SHA-256: 4cdc78415cc0145f4352d35921e55a1d4a4219619c9fccc82f4f31f6677bc2c6
font_01_sfnt_off000113f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F6 10288 bytes
SHA-256: 4325e4a4f64f16a9260304d76ac6a3345cc360fe07a215622141c2373d1a5107
font_02_sfnt_off00012ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1