Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5379c7696fb4fb…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 01:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 17fe4bf0e9810d25338d32a00a1db6f6 SHA-1: 1517f845afea85487885d5ee51c6821d45d8209f SHA-256: 2a5379c7696fb4fb8e085f9ccd1113984f807e71d918dea4cf0b6b9f2e6ab013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farms pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially leveraging JavaScript for obfuscation or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=java+programming+full+course+pdf PDF link annotation
    • http://surausa.com/uploads/files/66276129650.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/de7f6f71304ddb510b50c9b2e50a2516/44110073117.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7e7d9e3d2f9d4b536593cabfacf68fa4/80129092660.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144dcca79ee2---86376549049.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/biwidurojuvovanojadawotis.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/xudajogopexivulat.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109100406236077.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/96601123566.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109100643136172.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/cb27ecdc6521261e73b8195bef09ee5d/mapewed.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/29141830130.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/74947920060.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/c73b99f9d9714b5be15552b6b9cda67e/26703611289.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/84001142923.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/susepidetilin.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140a862aae68---verunomakepof.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/vesuvogupexiruwedewiwugu.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/vatonijelowafi.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0e312a862e4220d26d0a2bd95c1ccfdd/85806754373.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc9d80c74---lixisekuposopiranetigas.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/lakapa.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/97223611514.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344c559c2ca---51997446725.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_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 18348 bytes
SHA-256: 3f06e3151bd96c7fb978adaa8278b0674640f1957144af71ab2a9bcd41c195bc
font_01_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 11020 bytes
SHA-256: aa38eccee4d90bd8f549a7ba0ed11e3d309fec163355a30380a4eedfbd83a3c4
font_02_sfnt_off0001215b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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