Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5ae57adb9e2546…

MALICIOUS

PDF

100.1 KB Created: 2021-09-01 05:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf93bca5fba20a032f58ce7e0c7091d1 SHA-1: 0ee0dc7acd4d148bd14a9fdff5d6915a09c743b0 SHA-256: 6a5ae57adb9e254644436b3e0d2b1f1409c83572ba5086766766b7758cd0dc6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farm patterns, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crewmak.ru/uplcv?utm_term=after+movie+streaming+free PDF link annotation
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c569992b0---kanawuvuwedujolog.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070c5d48f766---raduduseveruxevuzuxugurol.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094713094dd2---25799916989.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/jafubomogowulutisefepim.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a96b2efc5b---79549578605.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/lorafekelogijop.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/xuginavi.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/64615694339.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7a712091a---86931301836.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102ec03121a1---bujulegumixe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72544e8ee5---zotegu.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/81eb1fea5e8901074d1c3adbf04e574d/472100107.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb0e587f0---kerobosinuvasuvaf.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/99859163303.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baca122cce9---87995580649.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/72403849514.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/fa3c63fbbb1d9fe1d1e23fddf9be71ad/loduwexe.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/23197813096.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a7ee8c3d5---jejilixisi.pdfIn PDF document text
    • http://charontrade.hu/data/file/84885254658.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bdmhhecpoiecjo7i7p0jce7au1/27382769536.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/wilupetolebazabitarobu.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16102b466deee8---59463254255.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/12896945176.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_off00012402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 10556 bytes
SHA-256: 1d3d24c3de57d91d13fe3113557ed182686a0cac6f5954eaf437245bbd8c18f4
font_01_sfnt_off00013c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C26 17932 bytes
SHA-256: 15809ecbd67669eb27a7c215e7f9acddd51c45fd616378e407fd26312f501ca3
font_02_sfnt_off00016a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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