Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1b60d0f1f3e0e1…

MALICIOUS

PDF

125.4 KB Created: 2021-07-29 09:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d125e8ea3fbb1822c6dc76d24b7d2a8e SHA-1: 1734b5d93e2a4bcd0ece81f2ff0704e3266c9ad8 SHA-256: ec1b60d0f1f3e0e15455f0a0677b88091c2694c7dc7e2c7a9fd7864744f98a91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://minuspk.ru/minuspk.ru/userfiles/file/91147301753.pdf In PDF document text
    • http://svx.su/ffile/file/4409860529.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/58354291dcd3fcc5addcd76bdff70378/14940641501.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/nuxutegepabi.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/fdki3pb7nimp5rt1hhe8j7r26f/zukapapi.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/abekhorsln3u2l8t0mg0p2gv01/vizix.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c05de30f9---91868327826.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/66171235791.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/zofamofegovexizigutag.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/goduvem.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/42341145157.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/284b9aefffa6d76aa5d93e547059d06a/bivabagemuwuniledatadewex.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a7032fb8ada5cd9c38f0c8065b58325b/zavopenixiditogazixazeli.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160748142200c4---wovosebovamenewerixeki.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/kivimuziko.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d987a7a4ef2---62026653062.pdfIn PDF document text
    • https://united-advertising.net/userfiles/file/sabizi.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4ba2b326049f37f8e591b03a67d28ede/1316006220.pdfIn PDF document text
    • https://pavimenti.pl/web/uploads/files/76334676059.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/86699135901.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/luputuw.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174c7bfd8d---86220771433.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/dejuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=spark+worker+java+lang+outofmemoryerror+java+heap+space+intellijPDF 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_off000181ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181EF 18392 bytes
SHA-256: 902e91c5fd0ec3202aa350525b907ebb18f26d0179861343ddb17739bfc78d99
font_01_sfnt_off0001b2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAF9 11592 bytes
SHA-256: c47a76c83db108610e9a72d6d78d0b5536bc584b1cf630892ed01698b5d513fb