Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67e1c0278a8bb86…

MALICIOUS

PDF

97.5 KB Created: 2021-09-07 07:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4236837639630064cc20c59c13469da8 SHA-1: da8d6e86309fea87fc7ca197d3f94be1bb331b42 SHA-256: d67e1c0278a8bb86dec56cd29ff2beb82941508514982eaeb01db22c6ea7f7d6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://zrdb-drogbud.pl/Upload/file/77609586975.pdf In PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/96c3de7fb090191ca3d151dbc4988c0a/vegixiremutopulemusesa.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/balixugot.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/45519365357.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-7/20210907100005479231.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/28592885078.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/54178882811.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac07c9e72a1---mifagirisaxapekasili.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/34442617734.pdfIn PDF document text
    • http://lamdecal.com/Images_upload/files/53996652783.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/44945859818.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210715_B6AFBDB3BC2FAAC8.pdfIn PDF document text
    • http://benly-carson.com/product/files/10467762865.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210822065306.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/62775491577.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/70203210960.pdfIn PDF document text
    • http://strahyi.ru/images/file/levopawadi.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749666d09bc---bidarevexi.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f92365cd---77061604265.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/36947702401.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/76183574147.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e33204d2099---duwoj.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///lipikutepetafaseko.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f8030aa04---kurotenanepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hitachi+nail+gun+nt65gs+manualPDF 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_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 16668 bytes
SHA-256: b8f9efeee9dfc86a50576fe980aba43488799e16e848de822fab29824c0650ff
font_01_sfnt_off000147ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD1 10720 bytes
SHA-256: 58376404944f696607b1388ef96144228a061682ff240053f0b3f634dbd9eb35

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