Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9da453066361be…

MALICIOUS

PDF

78.1 KB Created: 2021-07-28 00:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 864ff8bdec11cf663fbea1b6da3558fc SHA-1: b5a5fa95080861f59d0b0faf184317c113925c6f SHA-256: aa9da453066361bed353cf105c7136119b87b8dc9430aa0a6b4c9dfcb9f1dd33
124 Risk Score

Malware Insights

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

The file was detected as a PDF phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, directing users to multiple potentially compromised websites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links indicates an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3586

Heuristics 5

  • 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
  • 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://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/62078560451.pdf In PDF document text
    • http://mhs69indians.com/clients/864804/File/65353485434.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d2b5f6401e781a2cee1beb52db669a03/86664506382.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e1c1953ba03305e1288a4f70757c56f6/85190347780.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/9917566022.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/kedozexetakapupudal.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/62687366736.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/32491869259.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/papokar.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7f394285---tebutubovu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160d0613c24b9f---fusif.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/wanivoseb.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e572e6ffe4---lerixafelujidakirovitor.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///fimimupimosobarigavaxeji.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021072805245965.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/42899803240.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/fofemirugosunowepuz.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/8h8f6gced7l6qa6b4nt7ci2a7a/pojetonamomovitisawikolal.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/bubagabeb.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/16481564171.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f95d4011db---dixadakezat.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/rpk22u2f0k9926m78qpltq9jcf/gevemufozafunivijonupu.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/eb26cda90024f15b2ff61d23366ab99f/rotomuwevarozezubetuju.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18907f9e7---zodudodo.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/79419245717.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/04a2366fbd7864b9825a8c6a2a70ef40/pavipesofalimagewumopak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+do+a+petty+cash+bookPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 10692 bytes
SHA-256: 5e2a2a8cd2e0212e27fa6cf91a96bd1fdb56f8f848a30529d8e0dbe6b4ace6c2
font_01_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1