Malicious PDF — malware analysis report

Static analysis result for SHA-256 912f56b23433f882…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 21:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc411d8e6af51548ba63980e6c533f8e SHA-1: b2c4aa554191d4fc12028cb42110477494a1862c SHA-256: 912f56b23433f88238c9e8e094850ec61dfc9a99de1491b6094dcdff6de8fbee
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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://inwebjor.ru/uplcv?utm_term=skyjack+sj4626+parts+manual PDF link annotation
    • https://gulamanis.com/contents/files/libikalij.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/451dbfdee28c4585537db5d64cdb01fb/57662990389.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea20a861cd---rezosizozegi.pdfIn PDF document text
    • http://labsshop.com/d/files/molexex.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/busoluluzovavenotamev.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/relurofajagezizomidazafer.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/23426024932.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/9keqs4gtodsrkm698g924j9ei4/2394327963.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/24fc8ca188a58f96bc1ec8bb523c5b00/lagufibajepixivawixa.pdfIn PDF document text
    • http://novichiha.ru/pic/file/gupixavasofufikamabavuvek.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/a6kvkeb92ld48loq5ti147hen1/tuveloxubunufomufumuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b7b97160e---6885031490.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8ce16ebb07fb73be32b20363506ee313/64265951096.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608c12303a097---75553639903.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/472a6a8b6334b7acd924631b3ed50a19/73078004916.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/35716320291.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/670379d41f48370a56b170dc86908145/29575839771.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c219f7d53f9---fufate.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/jifeperekurinuxaxinik.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16082acad6a2ff---zafopox.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609431d0bfd00---zuvemofuru.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/61331681838.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/rotitape.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_off0000c50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50A 11068 bytes
SHA-256: 7d4c7a9f3d3dce452f1498e65add8e278bbd6e942939a91fa496a9821d4f5848
font_01_sfnt_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 17296 bytes
SHA-256: 4d8b96c5332fa911434576428f026c80e6d8b7ff948adfadea46feefd552bc56
font_02_sfnt_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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