Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e7aee5d39336d9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 07:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71703c6a4a5a730b733c1d4d45765b97 SHA-1: 70046611ed4ad6b4781856db1619dc81876aca90 SHA-256: 19e7aee5d39336d9a96128b74a251a67f75ef006dfbc0270d9b8b06893f57884
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to download and execute further malicious content. The heuristic firings indicate that the document is part of a link farm hosted on compromised WordPress sites, likely serving as a lure for users to download malicious PDFs. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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.
  • 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://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098317dcf570---35872457895.pdf In PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/20824074480.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/70496e90e07998661c90f242c85b606f/tabipisawasegojiji.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/19038082810.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/runutos.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef2ad05b0---bajelexuwipekus.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/kazowerawoxevufubixefos.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/b97765209bf23b8fe147a16a24659f0b/womavamovubuwibo.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/domikilazabozanixaleguv.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/vuxukir.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/lutikefosuruporolo.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/jerazasidoxokeredu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9cc639161---69418013278.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/forumuluxo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/42412f6cd77886d988b2ba3094e94d3d/xaxewugowi.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb7bcd42cb---31627494563.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/5448646416.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a47edd4fa---97492300224.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/bogobebiwumesemumonijuk.pdfIn PDF document text
    • http://checopharma.com/upload/files/25684254404.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071b523c6c67---70305643540.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/ligolanodizajugonoxadegu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096455f93234---6131135772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=python+basics+a+practical+introduction+to+python+3+pdfPDF 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_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 18700 bytes
SHA-256: a233b0b500fdbe1ae22a8b49b640aa93648f6be9c44c9fb943a80784c7c26341
font_02_sfnt_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 11112 bytes
SHA-256: 1c2f8db2b0302bb0e044b461367573c9734441859527979bed1376fb74d930a7

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