Malicious PDF — malware analysis report

Static analysis result for SHA-256 c271e6d68c8d1684…

MALICIOUS

PDF

80.2 KB Created: 2021-08-13 22:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 226418efa912c4fbd6c817ca93f968eb SHA-1: 895ee6b474bff4ee7e1206a2a0c798261c5d258e SHA-256: c271e6d68c8d1684703b9feef6e08e7c188f18a4859006472f4fca24b400d983
172 Risk Score

Malware Insights

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

This PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The presence of a 'download button' lure further supports this, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • 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.
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=ways+of+the+world+a+brief+global+history+with+sources+4th+edition PDF link annotation
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/t9gq7uhr7pgiqroplgof6bitvv/96603618915.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/1a7669c42622dc7a2d1a869c4781c9fb/rozadopibesoxotexepod.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a7f7648ca6606d9f475284f0e00325ef/16905891417.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d345181ad---97152661593.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/ruzadadokepivewobolivetos.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c301a26444b---71427455520.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/9097318836.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/33351394712.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/gogomitatipugaluboge.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/jobomivijijanojirev.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b8b70191b3d42ff07ad75815439a6cf6/venaw.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/79450517832.pdfIn PDF document text
    • http://sivam.pl/files/file/53908273824.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/juwojugab.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6587901d32---2975027220.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a68d01afe4---22717817054.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/xofarujelutep.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///11342040322.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/32693762735.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/katerinugegu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e5ebfa8a84cbfe0687487d56f305a5fd/pirudupukegi.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/4154skh83t027dh6ravhgs8jq1/zalevikibelutixizot.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0851f8f0---21915426840.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4f47cf8e---dejagadelopifir.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5d8bf245f1913780660b4db06377dcc9/52034400306.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609429230e051---zuxowenopefa.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/zanaranevoxosigaw.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_off0000d297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD297 11268 bytes
SHA-256: 46fa847552a399f458a4dc4c13a1111e8fd26f306e338b9b0830e1edd02f4539
font_01_sfnt_off0000ece3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 17144 bytes
SHA-256: fbc722417987bc2d8a8d21051369c7be9de28e375e019b9ef147578ed27032ed

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