Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49fb3ea0ff5da4f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 13:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6638743512274be3b951ef2c3fd5320a SHA-1: 6c9d18f7a62dc9f861088d56c6b0ca05efd83635 SHA-256: f49fb3ea0ff5da4f08ece75aeaa008f7ac56e26e6a65b4fd9b0d62d74f3b7851
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a malicious intent to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://ruiguoex.com/upfile/files/2021/07/24/vigumebas.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099368668328---5089976940.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuvolevebunedetutex.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd35dd477e---36275313919.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/zotupurepokamoju.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/6837755238.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/soweranivikerexo.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/bajemusetanubobixi.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/39137910662.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/nerusewopolofilojije.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0718253b327e67a1c9f45f7abd66ab52/dujimabomipovepimuzadi.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/54932232673.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/kowonulaxo.pdfIn PDF document text
    • http://billsky.ee/files/file/tedasovufizumagub.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/95333760946.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/josepitijeraragabege.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/bigupapo.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/979f08f9bcb600ad39f8c646b484a6d2/27863472114.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/92d568b6cc86f876ee7a84e5b9775203/juguxoxemifuwodivapamul.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/jalukigiwufen.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b0cf506b1---67971663742.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/diluxegabojos.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/wotesodak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sailing+the+wine+dark+sea+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_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 10912 bytes
SHA-256: 2f7c8aaaf8338b130889f8b22af4adc72c1935212bdd942c1bab121dad37ea1a
font_01_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 20560 bytes
SHA-256: fba052b0379fcd4662ea1fa732dd216145783ba92eb2a9ffadcf520c681ee794
font_02_sfnt_off0001338d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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