Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e2e97abf31b756…

MALICIOUS

PDF

85.6 KB Created: 2021-09-15 22:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf134ed17c9edacf07217651be220c60 SHA-1: f8f4c71e9b7c41bd0bb2892d1ffe43a5518db7dc SHA-256: 43e2e97abf31b756983f91e3d425cce3fd172890806a8a7a162f12c7c95ecec3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crysiq.ru/uplcv?utm_term=harry+potter+hogwarts+mystery+hack+android
    • http://artin-intranet.com/ckupload/files/90689189807.pdf
    • https://nezrenweb.com/calisma2/files/uploads/nesirasuvixatos.pdf
    • https://jmcoverseaspvtltd.com/uploads/files/robizelaraperi.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6a4641601---tuvidibosig.pdf
    • http://dichvuhieuchuan.com/upload/files/kijesesalobobano.pdf
    • http://4bx.pl/public/file/pazedixusonagajodas.pdf
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/xidoretiwokijikeribupadet.pdf
    • https://avflash.nl/upload/files/33042192210.pdf
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/wofivezajokirevezorunox.pdf
    • https://xtremefitksa.com/ckfinder/userfiles/files/pudiruwuzajewije.pdf
    • https://bakwanudang.com/contents/files/rufilugujefi.pdf
    • http://lamorenj.com/userfiles/file/sinuwozomopiwewadipex.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f096aa63a964882e274a431a73cc067c/dusutas.pdf
    • http://amsuatrust.org/survey/userfiles/files/74983703168.pdf
    • http://boxethai38.com/upload/file/fulokub.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/8cbohgcv6mmg6nbo3pkbr2o8m0/nitiwotufonakuve.pdf
    • http://belovosushi.ru/files/fekisex.pdf
    • http://ebslang.net/_UploadFile/Images/file/61520519790.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dovanefajuv.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149dc96f4e---55956120131.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320c3146dd9---gegev.pdf
    • https://jagominum.com/contents/files/53006752403.pdf
    • https://wildarium.com/ckfinder/userfiles/files/miduxu.pdf
    • https://ccskin.com/geektic/files/bisigidamaduzalezuxegifif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e974.bin
153e423bfa9760acf64bc208e09a9af013fd65e57daba302f907776d83dec32b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 17476 bytes
font_01_sfnt_off00011674.bin
4b8959e98088556d80ad955185a0e99bff2a00888955313e6b31987d961672de
pdf-font-stream PDF embedded font (sfnt) at offset 0x11674 11200 bytes
font_02_sfnt_off0001305e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1305E 16792 bytes