Malicious PDF — malware analysis report

Static analysis result for SHA-256 6183e42e169a7cad…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 00:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90a01bdc66c58e2fb268e9d0bebd49b6 SHA-1: ea2c698b5c2256bf6ae9b8bbca41130c977243f2 SHA-256: 6183e42e169a7cadcf4063ab383d8649ba592521e472fb0bd2da75a863289c98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on potentially compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure of downloading an executable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/desogujumimab.pdf In PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/94084127198.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/wowezig.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/guvazijifajususonegiba.pdfIn PDF document text
    • http://cartopack.be/Images/file/denovanawej.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/pinunupew.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/kekimoludegogegakasuv.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/sakunexetudalaf.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/torisexoxogojowewoniji.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/98576959277.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/nipetimiko.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/kedire.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/lhb2olruh99mjv3omf5krr2kuu/61205161815.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/e63fc74f7c46cc4b99f34f72e41b85ee/burazidibidegatidezite.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/xodutapo.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/dolunezigukutetuvozukade.pdfIn PDF document text
    • https://raljob.com/userfiles/file/41441764595.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/gexowasiwivirofavutaje.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/62226607293.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/12186991773.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd6e3d231---tubeniru.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/dusimeje.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/67014610033.pdfIn PDF document text
    • https://norservis.com/files/files/xomerupos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=apk+file+manager+for+windows+7PDF 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_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 17688 bytes
SHA-256: ea2ca5ae567a3fe0471547788a0c3cd3dd0081277ae72bab90376fc3005a68b8
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 10952 bytes
SHA-256: 3251ca73e7736c20f40350806c51ce9c341f09ba997066571b6cf3eec1e1cb08
font_02_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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