Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a528ac5c78dad8…

MALICIOUS

PDF

77.8 KB Created: 2021-09-02 03:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a05283d84c370c2bb0c884530f5b3b4b SHA-1: 9945034314787746a12053afda0899f99259a5dc SHA-256: 19a528ac5c78dad81a9124cf0093537a065e82b49086a4e955ad8c66030c745f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, a common tactic for phishing or distributing further malware. Heuristics indicate this is a link farm designed to obscure the final destination. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=105+lbs+in+kg PDF link annotation
    • http://kapalishakti.com/ckfinder/userfiles/files/wosokozibisu.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/tewozodatonuwotagusugive.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/jefutotinadumajefemapagil.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/bubifobowuda.pdfIn PDF document text
    • http://henca.com/files/details/file/lixetexazaxutatox.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/43336951622.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4327c663f---finarosa.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/zidodipifudufuterigofo.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/gomizeniwojazizopogibi.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/49122302219.pdfIn PDF document text
    • http://banquat.com/userfiles/files/jowefubagexoxivejagig.pdfIn PDF document text
    • http://blueyee.com/upload/file/202126101829.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/74706873905.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad2eec0375---mifeganodexaloma.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78445a4386---mopakizeka.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073230dc45ad---moxorofozalotixuto.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1020d01de---voxigigufojejo.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/tnrl3c39qukpig20ulme0lassm/supelidaka.pdfIn PDF document text
    • https://olterus.com/contents//files/dufofomudipik.pdfIn PDF document text
    • https://badrivishal.com/media/14151665255.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b2136196ed6---28762433129.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/a0046dab0f64de38c29a4e68a49dc72e/maxab.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/dapipawisesefuxa.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_off0000cc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 10116 bytes
SHA-256: f5a61313ff3d163918322ef48abdbb53c25185a3a8ba0af74bfba97332d6e951
font_01_sfnt_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 18084 bytes
SHA-256: 456b9162c0c9f576d45ac76697a7b65e44dbdbb59293d18601a355634bba876e
font_02_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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