Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3a14258828c881…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 13:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c6ce06e5985905fda6b8f47007c158b SHA-1: cfa1497b4c1166eb0997fb07ae604e034aff595b SHA-256: cd3a14258828c881007295f206ecb7ea7db7dfe03344b46f244e47962c611b1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.predia.cz/userfiles/file/37653397801.pdf In PDF document text
    • http://alexhofford.com/temp/files/file/wagarokezimababanuxerisif.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/0ea866350c2eb948c6bb3a31303907b9/23488047350.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/47681030106.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a261ce24456---85842224777.pdfIn PDF document text
    • http://skncn.com/u/files/vukol.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edaae3bd147---dukomebekezogagowonuz.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/25ac5d63f2ebdd1e5e208cefbceccc52/figam.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8ad0b4571f227960df66f35870eff77a/fadokufipomuma.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/sofararamafa.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ef593eb41---64735026878.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/puravun.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac08f10dcd7---84483241423.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/33252503731.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/53839670495.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/022b0343f29589dd2741dbc2db9665a7/28878101726.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/jonabusimob.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/lusoxokuguta.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/50727496087.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/17784834648.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3dbd9de1f---28571975413.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/61006615408.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161196bf89350f---xosapovefituwezovenewomek.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/54773076749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=segs+manual+highPDF 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_off0000c686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC686 10412 bytes
SHA-256: dacb3303f18063c4cfa13216f0042f312c895847c09034a8634e495fadb4bc81
font_01_sfnt_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 16668 bytes
SHA-256: 8381218804d1e88a8cae7ea1bd7fced2e60fd06c94c11c8f972b35e10232e187
font_02_sfnt_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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