Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0c2d3938a78bde…

MALICIOUS

PDF

95.9 KB Created: 2021-07-31 13:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f14e1ee74c47343a869a5778d06c1fb SHA-1: 71ff4499224b7dc1f5109dd584bdd0bf44eba5d5 SHA-256: 4d0c2d3938a78bdefabf1a099678205b19c87eafeb12df094c458a1c823aae92
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ayhancevik.com/images_upload/files/mopajinufogud.pdf In PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4bf331e1---7311974023.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/10028070194.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/84948206075.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/pejilodatupazamelunen.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/mubamebusujovipej.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/65773385922.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/19040396584.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/76eb1c585c384792c58d92f0962acda7/sutiruriduvawazuloros.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/34830063494.pdfIn PDF document text
    • http://teknis.it/userfiles/files/zijugom.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-06-29-10-47-10-fMNWpO6U.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a4e62eb09---zeguluvusesuwudebuloza.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/sakawafepese.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/20628210702.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/35274861334.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/54816415901.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9b278c1ee7676cc7ed42465699fef53e/15595147660.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/kikotivilebarefo.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/16654dad33e002099da92a8f779f5f74/49091309520.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c29aa46e---98508274228.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa893296fe2---35278967724.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/68309884423.pdfIn PDF document text
    • https://maisonforville.be/documents/file/37834507149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+identify+which+hardware+component+is+failing+in+your+computerPDF 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_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 16848 bytes
SHA-256: 4fc5b27c08e821f4d245b00b05e7488b29c54f165c23a1f1712d84e84bcbfdab
font_01_sfnt_off00013df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15607 11360 bytes
SHA-256: 4cdb540057cbb953a615fa606d8d2eb54054013a89426ab670ca25cb951585a8

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