Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3b47426ef28072…

MALICIOUS

PDF

85.3 KB Created: 2021-06-28 22:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd283ba89b6f8f516aee80c373a05146 SHA-1: 36473af6d4635cdf2986afa36af5472f2ea2970b SHA-256: 9d3b47426ef28072eedb88f900a4fb5b2108a6974c474af1616af1fc4bb636b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3canviq1u1v3ocgeqt0ekpdmro/nugeroxar.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad3004080---63791968770.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8f7654d65---99131433808.pdf
    • http://talani.nl/userfiles/image/file/15893513887.pdf
    • https://pellevah.com/upload/files/badejeretaxume.pdf
    • http://vencedor.coop/images/admin/file/jeviwexugetalapobipovin.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609861cf2cdeb---9061943365.pdf
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/4hfat9apadpbatn6crs2fdjuev/66066426099.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160866458ac847---vuxosabafewaf.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608c526aca936---38492403475.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f731765fe3f596e2613194c289390a6a/rubebasovuzijogezajerifow.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1b80ce70709ed4118e813f314673068b/57539637329.pdf
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/bowowenazu.pdf
    • http://architettotoma.it/userfiles/files/12189615340.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160724c4a8880b---fokurabidewegipuxapinuzi.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a9f303450---wigovidus.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/25d7169c971b78294f553f10d5d05ba6/26936324816.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609d583abf7c0---55008978471.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/343osqivtg0g9jrscvreg7jgvu/29766513119.pdf
    • https://zoorichi.com/temp/fckeditor/file/suxafuboroxujo.pdf
    • https://rimsball.com/ckfinder/userfiles/files/50098029358.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/agq42m3hrblfpssrpbl96cq1i4/pozexuladegebasa.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/ziwekojuvarevewaboxo.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/4b45f66dd8a53ab34531a69919d1d77b/50402700102.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cts+interview+questions
    • 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_off0000ee51.bin
d62933980a321c073c0cff0831fb39ea8f7612a976600d9e712e815219673bab
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 16520 bytes
font_01_sfnt_off000118c6.bin
16b1d9023a048f750d2cc5a88b5306c34c11661a78c71e09fef881c6940d6f6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C6 10324 bytes
font_02_sfnt_off00013044.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13044 16792 bytes