Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7e620ca51f8897…

MALICIOUS

PDF

87.9 KB Created: 2021-09-20 22:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eaf5820c9aeea73031eb2d7e3fdceadb SHA-1: 676c1de788b54869553501e5720d40fde7fb464e SHA-256: 0d7e620ca51f88974252c3e5d6f36b4ccb1e9bc42f4572e4a0353359558e7552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://synerhu.ru/uplcv?utm_term=mate+40+pro+geekbench PDF link annotation
    • http://szyldkj.com/luodan/images/userfiles/file/45585666485.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/55820873485.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/16908866690.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1979c9052---zovutop.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/43576299064.pdfIn PDF document text
    • https://cowik.pl/upload/wusawo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9rv2gohsl0tgafjfh5mj21oih3/wotike.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/nojomazupofewomowa.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161318445db219---98714631737.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/lewigunuzezu.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/xotiwe.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/74352144499.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/74362091271.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161366d8217d63---lawabilamu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec4b5c0ce0---71032136495.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/63823042705.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/30442761751.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/70687998958.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/50937441797.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/99889608072.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/lebesam.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/wudotobokad.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/35566774468.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/sebedowulobawabeduborebiz.pdfIn PDF document text
    • https://photofetimages.com/posezirulipotebadelepax.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/babagusiwijife.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_off0000e842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 10772 bytes
SHA-256: 332545c244d6449734f372817644b88efd66e8be23d4aa2676c38414423e480a
font_02_sfnt_off000118e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E7 22020 bytes
SHA-256: 0fd2cbb46374fec9d0c2c737752e52d74978fc459d1163a45fe9fbe0e1bf66ed

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