Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd7ddf6a074bc41…

MALICIOUS

PDF

88.7 KB Created: 2021-07-07 19:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b42dfcf83db020b2e3df5dd87f93fcf SHA-1: aa0d2898b624e9b704be477163da9f070b17ed89 SHA-256: 6fd7ddf6a074bc41b13295ba4945c3f508f4cfcb108624b12a188ba43d828a94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to various external URLs, some of which are hosted on compromised CMS platforms, suggesting an attempt to distribute further malicious content or phish users. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d8b916ddf6d8a9ea2c59161ed3d4939/448436965.pdf In PDF document text
    • https://partnermind.cz/images/files/84590648476.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/10924813573.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160743527d5627---febogavotarawenuraxe.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d524e4989fc---kivit.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051923155573499.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a423062e621---gubumuseberetama.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a230e15ea1e4beca6660fd1a650cf11c/nowep.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f1b6d2a6c---fumopadonimanijiv.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/delivamesori.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/80999772603.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a123b544e14---37524575678.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/813b562397029b2a2959e48f96798771/bixekolilawelojugebe.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607174f246aae---89787629318.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1fc4a0b79---24156638958.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a0d385d60f37daf271584605e534f52/48205447371.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070641bebf39---90521923435.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/xuraguwusu.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/32469586585.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/6dt5p5tf8tqii755udj5bj4cpl/6684484020.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/guzekomuxubolelewuxovus.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/bevinakonejanufuposuz.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/9c0f5e5e21954fc6674a4b614f93afd7/71856700242.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/fnha6ln1s6ftervok0fed22kpc/zabutalemetobaremevibexoj.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/josepawobasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+hunter+call+of+the+wild+tricksPDF 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_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 10812 bytes
SHA-256: fb0f75df651d179bb286b4107372a7f29fe4bec401f8cfcaa034d4bb1b22c55c
font_01_sfnt_off0001106d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106D 17184 bytes
SHA-256: 2765da1610b08a3521d6f0d435e7ccbc24dbb58bc196ae79db1d3c5e3cbd0ad3
font_02_sfnt_off00013d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1