Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ec277d3d990c6d…

MALICIOUS

PDF

87.6 KB Created: 2021-07-03 12:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ba51fd8c4c80e05ab8d6bffd4a778dbb SHA-1: caaae504bbe37505c4c454d289a94e07f3775764 SHA-256: a9ec277d3d990c6d9800c091e83bd6f1d0c9c98e7541f4c108612817ea847132
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or malware distribution attempt. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised CMS platforms. The presence of multiple distinct hosts and UTM parameters suggests an effort to obscure the ultimate destination and potentially track user engagement with the lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=reasons+for+pins+and+needles+in+feet PDF link annotation
    • http://khyljg.com/uploadfiles/files/70901345202.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/31120000897.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b2ae5abefbc6ceebdee65f1c95995309/walivomi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e2f871474---mekakaf.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609251737161a---26586045198.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/1c9248df4c5270a03b017eacc1e63521/48638337785.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/57368788093.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/12631683135.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/13500700866.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/23395816294.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69a0cc6444---ponesubaweju.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/25452255799.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088df9e88b17---xubala.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f8bf1c450---91659276533.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/4211189559.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/6b1f8e894e81d668517a5e188c2bd617/budekobopujivogalasege.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a9791882dba---9421008411.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607975b3399c2---lefipagiseruravunamolugi.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/xudilaxasabobegaj.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e59df782600f96fcd75614184aeeb636/34397267473.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9vtknn0rfbnp0k9pjqf3lcl1j7/78728744967.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/ziwirikakapewones.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/12102317315.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5ccc5b2469afbe8623abef8eb583b31c/46395432950.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607049a9e4ce0---38477194621.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae8f30ed0---fetuxubumavaz.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/92884928606.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_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 18272 bytes
SHA-256: df88b3b7cfc78cfb6ae68a1c272f43d8cd7a295715c4a0e17c93670d98b6efac
font_01_sfnt_off000120b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 10536 bytes
SHA-256: a7e5ab0003a220cd4e9520b787a11223d67021c50bc0d39a6fd70b323d59c4d5
font_02_sfnt_off000138d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1