Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2c0794c8ec4e44…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 08:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 151d127fa990246163ef286f2b96b5e8 SHA-1: 90951c7de1af9d353f3ed2fc01338f9791557217 SHA-256: 1a2c0794c8ec4e44b88001acdaae09e2c39e47b8111104c56938195d45b20858
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious redirection. No scripts were extracted, and the document body was unreadable, so the primary evidence comes from the URL analysis and heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://kerekagy.hu/UserFiles/file/defitutukep.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135163a83262---sizeximis.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/93751360297.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/9738479118.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/89870561245.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/59199164007.pdfIn PDF document text
    • https://2winit.com/Files/files/ritumitarugag.pdfIn PDF document text
    • https://remini.hu/userfiles/file/25721269847.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/gasonexibisuwir.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/barisobi.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d84d7aad35616c10087b68e3853e9d36/66433104123.pdfIn PDF document text
    • http://pasted-radio.de/web/files/1847949483.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309554b2c6f---88296357972.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/29256128880.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16132e906941de---55613976651.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/28m4sujuag2nlic0t2fgjsepf4/jukemupawibozekevodisog.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/fafupefet.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/sokikikisamawomujikowixa.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/tuxukavefabema.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/98378764276.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0688593001630542058.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/55418059059.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/ragalarisokiliji.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/maxuvadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+gmail+alternativePDF 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_off0000db84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 10468 bytes
SHA-256: 750cfb8fd02c6e47501357c202b20ed7861d17c769eeb9a9359fd03770ea5674
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 17852 bytes
SHA-256: 56821b715b81baf4c88e537e25e47fb11cf3cf72ba01ea59a545e3d4adaebe3c