Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a1c8d9650f0701…

MALICIOUS

PDF

78.1 KB Created: 2021-09-14 00:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d5b1cd5141173451d639156780d76f82 SHA-1: 6fe358c9e930f9c1a79e02aaa7df2433f1c9b5a2 SHA-256: e2a1c8d9650f0701b3f605169388272af37278ae3764f181de285de4951409d4
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 0.9975

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://medvor.ru/uplcv?utm_term=pok%C3%A9mon+shield+apk PDF link annotation
    • https://curvy.tw/upload/files/xugaru.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/88655863343.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/5650238794.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/74368949942.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210913015246612762iuz8dvbi7vm7.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/19007010751.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/bamotumagapebudigexid.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/pudunopatozimet.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210903_023422.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/30180454862.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/18831709530.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/a210037bfe20731709b1b752da81c9a4/10359150881.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/kagamonalu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd499c91a---85914319017.pdfIn PDF document text
    • http://anpharma.net/upload/files/99372096499.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109062019107354.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/komuvurigawuzugififaxek.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/65522967671.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/87488728290.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/80900111712.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/66411031108.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613a25458fb7f---jebusopawise.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/66122623400.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9ae3b18d1---barigaxifisuxixuvexivazix.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_off0000c997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC997 18672 bytes
SHA-256: cd3375844bf24dd79a29104e891ff23c471d20ec57d3021cf28cd96aba16b88c
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 10708 bytes
SHA-256: 8e79386a92d986bfbe4993f6dea478254d2112bf865dd7a2095777ca8cd5c597

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