Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa9c61261a029ae…

MALICIOUS

PDF

82.2 KB Created: 2021-08-18 11:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: e888f245818073881a864ee809ae56de SHA-1: 40dacafe958dee2df568ecdcbff542aed9357d49 SHA-256: afa9c61261a029ae5ef6cf9c8e0c9eaa8085fd92c9ba4726e035b481016c394c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.hz-kontejnery.cz/ckfinder/userfiles/files/vekigubigobubu.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ct6sa2adn1nosdtgbulttulp2e/12292244373.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/padiwoxisarobovebon.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/kixitoxuregitadedokidivad.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e0e2c486---37926893085.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/70b2a4cd606ee60e2a2024e22aa3252a/xezokeladademosobixak.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3f3030fb2766b76f3a7a8f159ee706cf/11853203027.pdfIn PDF document text
    • http://bwc.lt/i/87107912075.pdfIn PDF document text
    • https://ksboutlet.com/file/files/gogusekijixisotetutex.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pcncj4j78ocu3ior15blkriuk4/xozono.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/79941721759.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/pazufuliwekovemaketa.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adbc948384c---misukukewuwenilani.pdfIn PDF document text
    • https://andhimazhai.com/images/files/98825214131.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac12166ac90---62170813865.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210630020516111.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/05b3c87af694c148bf28a49c332e6262/90238112415.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3697acbf9---tizozukelosakimojemifadif.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/fepuzifabazonusuniler.pdfIn PDF document text
    • https://lemanssrl.it/file/febotesitumebogatewawu.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6050a1594c---25854336564.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/kefozakego.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/89052365085.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/90577590259.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac812cbf3e---bizeketifinilodox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+write+a+newscast+scriptPDF 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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 10400 bytes
SHA-256: 69b8ecbbf8115953305529a50ab9d85c9008f392479467fe640f8ebf11ca3557
font_01_sfnt_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 16516 bytes
SHA-256: 241bebe7a8337e8a00490aa6965c9f26b16ca95396f79f4c31d3d1ed91dd878b
font_02_sfnt_off0001220e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1