Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6016590e39b06e…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 01:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ddae6f0c985b0c25da01dd315baca914 SHA-1: 5986923c1cd640ef5ebc8cc9825af9cab9cfd656 SHA-256: cb6016590e39b06e3af65e91cda77003f722ba9e5a1c94bfa45c2faf6468d75b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristics and the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tidymoney.com/ckfinder/userfiles/files/42551562961.pdf In PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/29021022310.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/sorakunorel.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/89859727568.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98900882876.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/xozakoguvegojemexalesaf.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6e36a344---72152894006.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/vugopeb.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/bevumodevagadazidiredu.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/dajupa.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3b6170204---80820986789.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/64066157187.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/zejoxupojematupuripexur.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/5060526350.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/75302230005.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/90266090319.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27636797821.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2cc43e82f07e3daee212902ab7e4f0fc/zoselonuwi.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/93651435528.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70170549295.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210929032453.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/xosixukejopovuz.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/23433565916.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210906142056.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/44127645318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tracie+spencer+all+about+youPDF 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_off0000b3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CB 10684 bytes
SHA-256: b85d9fdf755b56da8abef4d78e512c2475059bf2bb831a9e1d8d110a57f2b106
font_01_sfnt_off0000cc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3A 16520 bytes
SHA-256: 938e646d4f3d7fadf9a8900e6317b53ef76a430a0e2fd44d1adc7d98988b8ad5
font_02_sfnt_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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