Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f63a77e9d91cec7…

MALICIOUS

PDF

85.9 KB Created: 2021-07-26 06:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0205da4df59a92591d160d0638983121 SHA-1: db68e20acd43e2447349ac43f5b8524b69486610 SHA-256: 5f63a77e9d91cec76f2201db5fe88b8ea41e1a600d7121cfa6eb453f43d2ffaf
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 compromised WordPress sites utilizing the formcraft plugin for file uploads. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae9e9c270d---xabepazuwodazajejixa.pdf In PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfa21e347e---fiboderarafujevila.pdfIn PDF document text
    • http://blueyee.com/upload/file/201936206300.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160926c18ab3d6---kapemefezegoxizubujeje.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/sobedipun.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/24022958767.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/10145692900.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb371a7750---wotedarimez.pdfIn PDF document text
    • http://willbramephotography.com/ludunanejamoso.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/bexokokidifilasuxepuw.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d0412d6f9f62255880908fd32ed9ea48/95197208422.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/79724676780.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/33846987683.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/kufivez.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a024f6c5bf---87604953251.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/b2216bf7be978206b873c13fbb9b7c10/jifigubovojife.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/zatedefal.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/27098132878.pdfIn PDF document text
    • https://masukpt1.com/contents//files/nefamu.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/bcb3746e8d88c46cb04227f4fedfe727/23304142128.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e1cad285375---43891839520.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/83430879fbe0ef708be7d85896fa6e9d/76643651330.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/99813292052.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b0deb0eb670e9366c7d44352d1c22df1/65101279995.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609403e1c9a65---xugivixugeforute.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/k2sphka8sprruio9g2hpmal4pm/nigudenazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=emergency+4+mods+frankfurt+am+main+downloadPDF link annotation
    • 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_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 17944 bytes
SHA-256: 24fd9a3469022dc1d88de8e1f158cf9fd6c0ecc932f82ecf0d6864cba6c60f35
font_01_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0B 11272 bytes
SHA-256: 09e78caae47434bd409b7627ace9752303f87f98218fb5032ca27336b629cc8e

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