Malicious PDF — malware analysis report

Static analysis result for SHA-256 e454be0125c3c6f7…

MALICIOUS

PDF

118.3 KB Created: 2021-09-07 16:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6725a698a7d20dac871adda64f104f88 SHA-1: 26dc670e4e175f989bd8fadfc4461c0405de3bc3 SHA-256: e454be0125c3c6f795cefa84ce137a348b80a9d7db0eb36602752832dcfb5c62
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://pixomot.ru/uplcv?utm_term=oxford+successful+physical+sciences+grade+12+pdf+download PDF link annotation
    • http://theatresaucinema.fr/uploads/file/somivo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/e46f53359cb212f02df8e3a154006a6b/gotejejo.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/gigogelanazixomamudax.pdfIn PDF document text
    • http://gojjang.com/uploads/files/kopeludobisa.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/memosumojufimasu.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/668ddac6601103ccdb1b66f9f943a15e/vubasoge.pdfIn PDF document text
    • http://safetypath.net/cms_images/meretiw.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083832277331---zozezonesujubajij.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/neduzuf.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a04506ba---sidugidirodomivumalezig.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/doudrosqug4vti2tavc7qvqfjs/7498408134.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210703112325_997105.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084c0e45a99a---wumevumanodokaz.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/97417550510.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/nexovabodutejunopadu.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/33553762392.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/3a42c3ea4f72923022a1ff5ab7c46aa7/75278621344.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a45111bc334---kulexorobuluvesejot.pdfIn PDF document text
    • http://coumert.com/images/file/feloboto.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/j2ffrosm1vo0nd5299cohcpnt8/42997910763.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/gabuzu.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/gufisakekiwet.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/20042266249.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210812023021.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_off0001619b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1619B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000179ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179AD 20608 bytes
SHA-256: 1367d81604f87b283ef59975dca744b2cbca7ee1909ab9027f9eed3feb5cd5b3
font_02_sfnt_off0001afcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFCF 11400 bytes
SHA-256: 44576cf5ab9920c16483d8e539bbe98eb3910c684acb9e8876ca104060404c36

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