Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0505495d8cc869…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 16:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5b1be19e399a23d8df123a0101ed184 SHA-1: c5da71fdaa8e8c22d994a22ecc51cc1e83141726 SHA-256: 5b0505495d8cc869f207eab4449ca4cf74088ca72d48ee5d01f249b19977167b
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search engine results or lead users to malicious content. The ML classifier strongly indicates malicious intent. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

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://cructi.ru/uplcv?utm_term=papa%27s+wingeria+apk+mod PDF link annotation
    • http://kdsonline.org/userfiles/file/26351165990.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/76550020677.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/99895290159.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/ruzijigapemonagobu.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/8423983290.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/dibuvororalasagakewubab.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/32185104862.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/dejodewusagunato.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/94534639119.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/76814163416.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/gabajobagopefibadi.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/wifokerenud.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/ketirulojorixasunasaga.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161435f9c9e467---jonizinus.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4adb72df93c50892ba0e88605e77c4d9/nipidazozaxa.pdfIn PDF document text
    • http://sun-tes.ru/files/file/63829436752.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0929955d---91442510765.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109090403571442.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/devebaduk.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/sinisifopolut.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc2956167---pevimikupumugoxoju.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/morubovo.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/raroxajomelonefolaz.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/32000162203.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_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 10804 bytes
SHA-256: feb531be82aa1ca76620cdaca1e9d6850e7b20a3e0da1aa52836cec752fd6710
font_01_sfnt_off0000e454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 18508 bytes
SHA-256: 3da58ea72a93de52a6d149fafb66c4a1e0c52075d81909b6034414ded0ed519c
font_02_sfnt_off00011504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1