Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0ba14585654358…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 16:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 702b8870302233877347df73c4259e3d SHA-1: 33cf847fd1a158101ad0740b04e83f94028ee019 SHA-256: be0ba1458565435895eff4cd9cbf199c568db903f771d392fc60dd0d543566c2
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis reveal the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://jpt.mysmartedu.com/uploadimages/files/kujurinenujonezipuni.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da8049c1ca---11238203187.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/93661381973.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/jokufonutawaj.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/67739937585.pdfIn PDF document text
    • http://c-six.it/userfiles/files/zesewivogaxizi.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/46927911390.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5e4e99f56dc822b8ecb85a7d6f37fe6a/vufajevakomivibimeki.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/rusagipudijujusamozu.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/19832534868.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/41001941775.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/8229548964.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/90882912178.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/jadufijuzi.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/doxafamopitatu.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/8702775922.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/rawebesa.pdfIn PDF document text
    • http://sjhtractor.com/d/files/2023307751.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe5a6c17a---budukipupejiwulexigazakeg.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/7392825994.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/23758213617.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/18360736816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=identifying+verbs+in+a+paragraph+worksheetPDF 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_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 17940 bytes
SHA-256: 1e51f3dfaec73e4027bc4ab3f27d52d61c47f42a9a0a0879b80e4ae966832fed
font_01_sfnt_off00010292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 11180 bytes
SHA-256: 4fbd04f5a604f98062d23e952aa5699011018d0236915e07fa672cbf411aec69
font_02_sfnt_off00011c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1