Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6910b7f8e875b3…

MALICIOUS

PDF

86.5 KB Created: 2021-07-01 13:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5305c2952061dc59190772bc6ca6451c SHA-1: 4c8b33da519ebfc606d83b3a340c4f080d57b0ea SHA-256: fb6910b7f8e875b3794c3407667ec26401a7455716cd8da9627478df18bd12ef
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and detections.

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 http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b7b006103c1c70822889fcf6c1237f39/40295845139.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dce44215139---vikotusopos.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/pexokoro.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4a21c2c376a48e920f519ed0184e2b2f/79477927346.pdf
    • http://bsp-oblspl.org/ckfinder/userfiles/files/39078672573.pdf
    • http://diamond6ranch.com/userfiles/file/23491726363.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/04870e223ab32bb00f42a61bf5e01120/zelunugaxifulomom.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/dce12419c4dc6b97977cfaa1a1751b5e/kixaratetabamabetewale.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1chiujtfa00bbpbec28v636jai/pabuveba.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/941d741a464d08d38e61582edcb22276/85875831689.pdf
    • http://backkwang.com/userData/board/file/85320191742.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b804c66d9a---39479603827.pdf
    • http://biomassasia.net/data_ed/userfiles/file/17775370148.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/87c6df33d8bb6c94fef861b6a216b98f/linilek.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/p58rdm27qrj4akclovcvuvaql5/perivixulunavosexuv.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a5e4cad9e9710789ca16d09f85d9e1c1/17496480753.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7e7a1c8f0---kateteninum.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b673c0bd2---pewadutoruwape.pdf
    • http://ascensionchina.com/userfiles/file/xixebusa.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/camo9d564atrtif9oo0cvmf3da/41342287526.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7d8dcc085---vuwamazozudojonajisenekas.pdf
    • https://hotelindigha.com/FCKeditor/file/sosuju.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+secret+language+of+sisters+summary
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed65.bin
bb8932101e5e95edd00a5abd241b577acdea3af52c6d91b771fa7c11fc320193
pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 17604 bytes
font_01_sfnt_off00011b65.bin
7176afe1f3bbc3537608de0575962d7bb46e6904fc67df245fd8bc42b5ba6648
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 10960 bytes
font_02_sfnt_off000134b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134B5 16792 bytes