Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dd9ee2da40afd7…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 07:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e98fb2c42db2065a57a15561e6b01a83 SHA-1: e14842258c8c5cc0121da9aaf429440331dfd36d SHA-256: a6dd9ee2da40afd7abc6627a586e3ba2520855fe52300dad9a2324e4fd9a5cb2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The primary intent appears to be to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.tomasjelinek.com/img/pub/file/wireposakejogukeli.pdf In PDF document text
    • http://falls67.com/clients/50406/File/94044370842.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/28927564986.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/19451031645.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/31431866756.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/83867034700.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078237643667---doxapakatuwi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/96c96e98c683af9d486f3d9e3d2afaee/31346034048.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3ae1cdad453703a805bae47bdfcb19e5/zukiminomid.pdfIn PDF document text
    • http://ashioke.com/images/library/File/31036306553.pdfIn PDF document text
    • http://atek-ent.com/upload/file/61079700643.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/9ad72d50c2148183f004ea85d245a259/fadosigolop.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/86b5fbff8fc5547795c697776467844a/xemijeririzefiw.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021081207183121.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/gujorezokililupegupaki.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/06046b54ea2f41606f8ddd278d342420/juxalokubebumewaxufesox.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d4e5cffd1---kunotatigoxukogogojikaxo.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/66320951809.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/wovuv.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/vn978actmdqvvu2s2oar9vnku0/jawosawoxuvuduzen.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/51023141147.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612e8ada4342c---motakexutipiwetedib.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160838206e3618---pinimejovozu.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/bukinem.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fjp64e1pbfad97vhqks8er2i53/16986998083.pdfIn PDF document text
    • http://klefmarken.se/upload/file/53460572821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+are+dogcatchers+paid+worksheet+answersPDF 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_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 17784 bytes
SHA-256: 787876eaadcf6982630b1cf3c4b7c239a2c4d790deabbb4999957ae577d6bb28
font_02_sfnt_off0001229d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229D 10916 bytes
SHA-256: 0c6139e99ce5c8bc29b377e350d3d502f64c3fe1531c4571e52d49d3ae58f015

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