Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c3bb66f96524a7…

MALICIOUS

PDF

86.2 KB Created: 2021-07-05 21:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f914ec0846775f625b688f23357e494b SHA-1: 9830bfe4344af58c250edd059c6db4455d842cd4 SHA-256: 41c3bb66f96524a7a886e442a64cc290d1fe06dea14fc89ed324598e69c43841
216 Risk Score

Malware Insights

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

The sample is a PDF document that uses a remote-support tool lure, instructing the user to install or connect with such a tool. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=remote+work+from+home+jobs+in+arkansas PDF link annotation
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/6138c4e5ab4412a0ac2e859571c2f3a0/modolevatunozowal.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/48840228360.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaf18d5cb1---nofarazudu.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/dowupegeterireku.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/80084062387.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1939fb93a4---82395814017.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c1e55d6616ad58360404e3b5fbd1d313/vagelaf.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f2f7d469d---51765177070.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/8fab2d3c8233ca27c51ea356e997caa9/pobiwamawigowemapenubude.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/91bbc6b78e88ea45f9cfd736c56cb187/9334507485.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/96847450276.pdfPDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c04fede5c9d---81821228733.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/68711506271.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/41dc55afb2457f3e73afc20a203697ae/zaluxonigededavu.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/werukolelimigugagagog.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/bejakafukidelup.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/bukisanemefesanipa.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/c5e02293d1ef59e77439cc9795e1f160/vurora.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/96b201fa7920cb16feba1da2ca3bcdb9/7613307815.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/rogusuzoruma.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_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 16820 bytes
SHA-256: c0cab505effd42b11a29c292d75a173c856d5cb6d216ca3ae630c67a8a13670c
font_01_sfnt_off00011a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13294 10928 bytes
SHA-256: da5dd872dfba68e582dd9e1a733056dd84a55941723b3600d34d8c8693d3ea0b

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