Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a8f06315085e30…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 03:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a127223c97a8197f950793611180d709 SHA-1: 130a9499953380181b4f11aba1fd7340d99f7287 SHA-256: a3a8f06315085e30e570f2eff2385d08557cd3003e75b60af3ce7323a31363f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to trick users into downloading further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ajeah-intl.org/fck_image/file/55623773635.pdf In PDF document text
    • http://proallprint.com/userfiles/files/muvewabijefixexawotexe.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/zunesexesipapuxilepita.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/jevukogemesuzuwajomadene.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e140a63f89---putefotulererijewur.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/renoge.pdfIn PDF document text
    • http://ashioke.com/images/library/File/11812033869.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/12776812480.pdfIn PDF document text
    • http://suaups.net/userfiles/file/47983586736.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/tepumexiwajeminep.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/12994849477.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/62229877830.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/sovamufudi.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109081428479885.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/79757209576.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fc6a585f---12331390954.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/83280732162.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/60113474159.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/dajex.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/17105530707.pdfIn PDF document text
    • https://subded.org/userfiles/file/gufuxaru.pdfIn PDF document text
    • http://webursitet.org/Files/file/dinabugulubowatanaf.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5a3b1e84a---sarazopafutiguwanuw.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/14763695036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=play+store+app+download+and+install+for+desktopPDF 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_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 16716 bytes
SHA-256: 888f011bc48a8f100bfdabeaab7142895752f3d755671280e7647691f45e12fb
font_02_sfnt_off000117f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 10784 bytes
SHA-256: d75dce94c85f6c0d1aca02c8a77b2a92d4ba699f8435b666165043ee09384695

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