Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5e41f821c370f4…

MALICIOUS

PDF

81.5 KB Created: 2021-07-08 07:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 094194a1cf3f75e37c356fa8cc3b43ec SHA-1: f8e60924c6b8191c3636b4992bf537a3e8d36cc4 SHA-256: bb5e41f821c370f4c9fd9e7d961a7883653ba217246188de1abc0c94ca700b7a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URI heuristics and the ML classification strongly indicate a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a840bf3f49a---57077510649.pdf In PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/e8df0d0ede393baf4cd546d2f785cd23/juxojasajese.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/c76000e7811f0d1b5a775b3c4ecbea98/13452041893.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3c75e5f78---panafunef.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/43434858046.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/kafaxidixudukor.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/nedututamabeta.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/pijevov.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/44462041129.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b22f7f3d76c---90049841020.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/31822301261.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e2727b246---60780109527.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/30879641083.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079ed5c95666---ximodejapilorena.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783e099fcec---3459749308.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16097c817b24bc---jexovonazageg.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/13276334585.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/3b1bb8b6958af8161e477fc9305530b8/zoligetogapusegi.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/78c7b3baee6e1448aaff7fc6e1500542/86141347995.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/a52d7j1m8a6vjq4ls7rjvm1or4/2026348956.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/xagelazuwedererakuwiro.pdfIn PDF document text
    • http://budka39.ru/files/1247903814.pdfIn PDF document text
    • http://bubblesoflove.neIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=camberwell+green+magistrates+courtPDF link annotation
    • 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_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 10932 bytes
SHA-256: 883e7d9c750b98ff92ad9700b1a9c34571466e917d5304366dd917fb7c2a9e38
font_01_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 18120 bytes
SHA-256: 8bdbacabd5fe5b931be2796a37a608326b3664e6375224fc9f3daf3036aa55e4
font_02_sfnt_off00012064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1