Malicious PDF — malware analysis report

Static analysis result for SHA-256 613cf0e9ef93571c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 20:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 47348fd8cae044018e0dd855655d0db4 SHA-1: a6ac59a085d502359acd8cc9c7a2ee69a8301a07 SHA-256: 613cf0e9ef93571c7de46816a1f85e23e53bb66fb190d62e6f78b4867baad175
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous disposable domains and compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=get+out+putlocker PDF link annotation
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613058f0379d9---fokajor.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/27444957979.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/jiramanubuxuxo.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210902232217.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/81309178460.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137547f8afe6---kolamaviwipapubu.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/70986624348.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/af37079365f4068ceb405b5bf0d04658/lusejadotoredusedukif.pdfIn PDF document text
    • https://deepex.hu/hirek/files/48788629647.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/55597906784.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/16702119068.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/fuzozo.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/205865960.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9d2ee5a21c863249ff45d87e020eb613/86047855608.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/pomowikofiferifebujumelas.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109071301431703.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/58418486389.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/38295799426.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/rozulisikimewanu.pdfIn PDF document text
    • http://kahasat.cz/data/file/getinediguvafebepero.pdfIn PDF document text
    • http://parfumland.sk/upl/rudujebuniwavofarudif.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/14201719564.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/31617784628.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/90832877286.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_off0000dec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 10072 bytes
SHA-256: 9781c1247dfabdd35e27398de5d12be24692c45ce78915056a56408d9a83cfc1
font_02_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 21116 bytes
SHA-256: efed781fd7cefe14d421749f456e4bcaa9c3826a132774613b3ca8d698026034

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