Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3c517567adabfb…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 01:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 481a0b1587ff4f33e82fd99ea990b6f0 SHA-1: db3f2ecb3c022de77e997f4c7d52fd0c692a59c2 SHA-256: cd3c517567adabfb39fed080779ad84e1c040b45730989623842956d2256212c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rococosofa.com/files/files/51107764187.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c123eaef234---jitexejo.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60bdd7bf56---rewenodarola.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/49462634388.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/47333717766.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609dea6ce9889---mowudovisibupatiliwof.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160874d489708d---jejafop.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/rad0jcq72dv03evtknjl101rv1/49352779066.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/jaranivav.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/18931885595.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b284376d79---70068979092.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/lababutagitujape.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/58954049314.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ha6lf4gjhq1cjcq7iuoqrmedeo/guletivevasata.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c6718228---pasatodesofasageda.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/libezuguzajob.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/82d6c4f1bc8b3fcf1f7730a0bf2c9c70/88704045698.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e94b4ac5e---xabezizufavage.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/96770739085.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd26e1c6140---moximomowelafizuzaridobeg.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/bekavo.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/rowugigujevisifexubos.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ba7d6afb0078674ffce50aab9a2bcb74/74052493336.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/e7818tios0semjljv0gj5l07r5/20238293433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=seafloor+spreading+evidence+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_off0000c926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC926 16084 bytes
SHA-256: e0a0b41ff3e4c3a8809ae09e90bc72241a8c8c37e7ae9d8bc036440688b0faa1
font_01_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 10836 bytes
SHA-256: 9e66625e519001a4ed94b38b4694e8871652704c017c6f55247daaa4e53483c7
font_02_sfnt_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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