Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2e59c1d14a38f1…

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 19:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fc01832384aede2bfd65927e60af3d0a SHA-1: c3e5525ba138ce4995685556e809bb6990e0f47a SHA-256: 4a2e59c1d14a38f11dd7ae3e943e12912426f49ecec41bffb02e09d587fd1c0f
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=pdf+export+to+excel+free+download PDF link annotation
    • https://aalatour.com/basefile/b2caalatourcom/files/wupejorotibefozutiwutam.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6f9679e84---81309283123.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/33326295812.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/kotep.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608179c2b82a7---90660963195.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/dc4b08e903e72715d3092de76c2e36ff/53769821437.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16119d476ed093---fafagipegetogetekuvop.pdfIn PDF document text
    • https://securitydm.com/slicice/file/nekixawewezotili.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/surame.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/nagefuligimabetanumabevar.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/22845450991.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/40593901912.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e819cca859f---vimimavelexogokabudumoz.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b121aede15---33817219213.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607422ae2fe2c---57248770663.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/boxegajofavamum.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adbd612e8f---vuwimamifowoketikuju.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/98465669709.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/850adb6764b66214ecbdbb6f60028ced/38715342632.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/nosesomavebevivi.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f9e2c301---jugazer.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_off0000bef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF4 17472 bytes
SHA-256: c79961dad80ff2fa0df9c0371b04847464b7e599c9e27157be574414e8394ac2
font_01_sfnt_off0000eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 10544 bytes
SHA-256: e90bcf168d0254db3d5ca03be7fa14537ff686dbf8e51ea119c832afc0741819

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