Malicious PDF — malware analysis report

Static analysis result for SHA-256 41237c214c015ff1…

MALICIOUS

PDF

92.8 KB Created: 2021-07-31 00:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19854e4bcc62e7a43076e95e3e09a97c SHA-1: 1dafdf4a370b2af86e0799d6a2e7ceeddc3a3367 SHA-256: 41237c214c015ff176df361a22a20933f4d7fbe5407baed796176988f04086fb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9aa16b636af6900301047a6b47bc35a6/74633697774.pdf In PDF document text
    • https://skinrepublic.vn/webroot/img/files/49950699349.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210714085959.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/kesejawuzunivu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ldgibc3g236523qqlfst16i811/rubolepub.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/vipogagobe.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b1581a4be---vosit.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63fb4a9ef3---23670774296.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609db5413be28---lekupowaxeferuzuwi.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/30552927616.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210705/file/xamabuno.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/novuruniga.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4144a0eee180b1fe319d6970c8c8c750/20656241180.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079aefdc7325---tuwipemapekawiwexadamo.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/7c04b033dce6f8fac010bc1d7cd2e7be/88538030906.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/oh6op9qpaomiu48mhbrdmb2581/74299246539.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/706d86e2791dfe14699a76478a6632fa/32137119947.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/29425359399.pdfIn PDF document text
    • https://argumentua.com/i/file/nifofogimaxenejuz.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/17484550244.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tlm9arv61lglt2m34d7nh7p6a5/57853076260.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089da9fb802b---10619886293.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/29505459189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=athlean+x+workout+plan+free+pdfPDF 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_off000107ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBF 17164 bytes
SHA-256: 2de85b7d9d23692d0f2f207106c3ec43e56900be9db6b4cf2dc0b6c182d5ab25
font_02_sfnt_off00014c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C43 10696 bytes
SHA-256: 4665ae3b9f10bef05d4d71a84afc5c428a149e3d8c8d4b5edc7e462caf352e7c

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