Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb39bc4c5585e75…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 11:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3938e671b95bafae875427444ed42d83 SHA-1: 03b16aa062031c125207be713f3a74d0595939e2 SHA-256: 5cb39bc4c5585e75b6098c4d9aa969dd215a740de3983280e03cf35d587d9aea
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, which likely serve as part of a link farm to obscure the ultimate destination. The primary purpose appears to be redirecting users to malicious URLs, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=every+fortnite+skin+ever PDF link annotation
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/309b190b67e58d8330641fcb22722cca/84645868044.pdfIn PDF document text
    • http://schokofontaene.de/idata/13852348223.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/50960751915.pdfIn PDF document text
    • https://aokman-drive.com/d/files/rejogoza.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613744275f50c---5053714289.pdfIn PDF document text
    • http://timebymtm.com/upload/files/19790118698.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de683ec72---20573606828.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147e11a6afde---lukarojiwitifonifaziterit.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/sanetutaxilopitoziz.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132388ff14a6.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/sutasesasuv.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/23514399172.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/37309183107.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/77931386362.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/ledafusuluzurifegix.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/mimulejugotokofoxefa.pdfIn PDF document text
    • https://panama4d.com/contents/files/lejanisosanunapuno.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/valuzulisirexevutav.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/86584233021.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/61216853452.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/luxogo.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/jovafawi.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210917183625.pdfIn PDF document text
    • 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_off0000cdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB7 10256 bytes
SHA-256: 1182c83c39d4c8b613708ba8aee51f078d7d2d3a0487419958a16dab8cdc81b5
font_01_sfnt_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 15268 bytes
SHA-256: 36734e5979c230418c446e0115405deaa55924ebd78464399972d388acd61531

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