Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5aeb545656adf9b…

MALICIOUS

PDF

77.4 KB Created: 2021-09-22 17:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14260e3a4490d8a1dd00790b36de33f0 SHA-1: e98efcc6ead8241e259088844037f86a141a12a5 SHA-256: b5aeb545656adf9b79414433408f3939fec53b1bfac65ba8c836ac2ed2e193b8
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. These URLs likely serve as a link farm to distribute further malicious content or phish users. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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://catamma.ru/uplcv?utm_term=apk+cheat+subway+surfers+london PDF link annotation
    • http://beta-rc.com/upload/files/poxapoduxepeginu.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/24210265297.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/fugotawununawizegupi.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/woxezofugokokutar.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/e08p1pug8j37cch0bnjcbjr9ca/77038390956.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/walabozup.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b97fd7ef302b34e4b9002922bf556374/58175701604.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/ravujejonikinuripez.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/goxifosow.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109130948034096.pdfIn PDF document text
    • http://zgic.ru/!upload/files/kisizasajedajafito.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/cb8fa6dde3cf01d6f8355a09b6525e70/16306213905.pdfIn PDF document text
    • http://pnalog.ru/images/file/60883884621.pdfIn PDF document text
    • http://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/82416615377.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/vuwejunadani.pdfIn PDF document text
    • https://totounited.com/contents/files/26114135568.pdfIn PDF document text
    • https://e-midas.ro/files/file/48570973393.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/jumesawabo.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/kunuvemunuwipuxetuxesubo.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/86536807190.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_off0000c3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 18836 bytes
SHA-256: 21f156e181645b4e964a55b943ec56b0eedaaaab0df54a4f35b2741e7242c473
font_02_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 11136 bytes
SHA-256: 1515fcc553461330aacd53990c74c3fa38f5e9535ddb5be4d3e4c48aba347226

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