Malicious PDF — malware analysis report

Static analysis result for SHA-256 72405236b2b2bff2…

MALICIOUS

PDF

77.6 KB Created: 2021-09-02 18:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 768cefb9ac7f309f27bc75374f10894c SHA-1: d52865b8327d540dc6507c652f5c499d8aaedb9d SHA-256: 72405236b2b2bff2a80a8283696bf72a3b69b06d2db03bf24f49da70b70c5eb6
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 0.9972

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=iti+draughtsman+civil+books+pdf PDF link annotation
    • https://kanat.com/upload/ckfinder/files/42625031737.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d2dc3626c---makoxekuvefin.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b37922a19df70059e0d340af9084493a/tizipulikinalaj.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/21719468718.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/93031670289.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/likuxo.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/ab134fb8344569b7b4302565eaa24a25/98178263444.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/bipavuni.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/tufowewaximital.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/14486803707.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/olo7h3nu0h4kpg44v51c3d49m1/10145992448.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/sarivurevejesosawos.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/rifologowesajedewulugij.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/forukepema.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612d70947aa2b---wenamixipivutubezumaju.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/36126081905.pdfIn PDF document text
    • https://ocw.tw/uploads/files/6125865539.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e943d7221d---midejal.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a7665e17f33---korunilamilumarirudiwigev.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/81322290710.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/wezapiporubijonorujus.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_off0000c40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40A 11284 bytes
SHA-256: 4867e2c110d58a3ae83729c4c9dc9aba63707f71b947e559fd74a049933170f8
font_01_sfnt_off0000dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 19608 bytes
SHA-256: df143cf40b7c410cf44b58e261d347fde84d39052588275df2a13a36989eb1af
font_02_sfnt_off00011117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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