Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf27054106a4ae33…

MALICIOUS

PDF

88.2 KB Created: 2021-08-13 20:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3259c292ec70c3a6e8e279be13e91473 SHA-1: ef944789816216e5484544ac3312ecc3718fcc8b SHA-256: bf27054106a4ae3363a1deb18cae3c7af8a82ae899ca8d3a374b441453978e9b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate this file's purpose is to act as a link farm. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://zzps.pl/userfiles/file/62730149815.pdf In PDF document text
    • http://fra2ange.it/userfiles/files/20375040008.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/patugupinutaxame.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/jakapogimaxurekenopuwebad.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/11247251689.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/77143434004.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58d99c3f63---49126004154.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/liwunizularabokewi.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/mosesu.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/22177949048.pdfIn PDF document text
    • http://simonide.org/userfiles/file/98559540735.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/93624945937.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/81415733659.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/21717953677.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/fisusalukasa.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aec152851---vibemidefegosujo.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/xuxizorudaliwipu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b67312610---13958047049.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4143bb1eb---63575870816.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086084559d72---murepojogal.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/24100145827.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/bobikozemibulotumeguwu.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/39708949104.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/taronepujefiwupugafadig.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b300ecc8464---kusafopemopodanifibenuj.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d6e788cca---82757523805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=el+pianista+pelicula+completa+online+latinoPDF 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_off0000f427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 17276 bytes
SHA-256: 7cd9c031f04bd6798f3ce7eec2890155b930bb419d4584dad218373226c6a2c9
font_01_sfnt_off0001200f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13826 10516 bytes
SHA-256: e4da15c777811659729c06d523b416bd6394a3ac94a78f21933abe0f7c6279b4

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