Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3f343428b0e528…

MALICIOUS

PDF

112.4 KB Created: 2021-07-17 15:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 4138e80c3e5ee05de895e45a3699935f SHA-1: 6e0a6e59b5bb80e14d3128a6b42ba6ec11b2daf8 SHA-256: cd3f343428b0e528f82c77737d8c185c0c14bd225ffcdc6702ea073d10a705c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • 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.
  • 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://acronimocostanzo.com/userfiles/file/30475341770.pdf In PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b87c7f21c---fuvevifonukawowabozarazo.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/19538484537.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dcd16bcb13d580d217cdeaeda2998e24/pevijo.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/44201576581.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/10102573388.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/0881bcea92fb67e2ae8ab23d69c480d1/pedomov.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/fixuwulodisemar.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/raxujarenomajut.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/44180206076.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/6941531326.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89192eded1---torofeme.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/d255d92b3cf577bd4f98a7aabdef2d5d/65963904917.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/salifibunidobeloxuto.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aa658c74263---dabukuxobexovuwo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5c3190f458bb788f98e2c785a00450ce/5024997978.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/nekul.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/vuruwabekutofoziviwuwa.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e1235b87826---luvup.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/titijofekekidununagipijad.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160969e3b541a9---kobugikarifam.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160974d3e3e6ae---33144636098.pdfIn PDF document text
    • http://wrhs1976.com/clients/0/08/080801f2a31a95d446b71e9836a5425d/File/91464598975.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/34316421755.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/vuturezagamijuvegul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=christian+movie+about+abortionPDF 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_off0001534c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1534C 10664 bytes
SHA-256: ec6e1fa86ee90bf22733bcd1c6e4d66388816bf1943d8df69a80a64872ac0233
font_01_sfnt_off00016b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B99 17932 bytes
SHA-256: a4ed06fca515eaee9c91fe7bb9bf55882ee45ca21b686a428d723415d3326ce4
font_02_sfnt_off00019a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1