Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf585ff65bf884b8…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 01:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1fd3e37d3d3066801fa3a93b3623e579 SHA-1: 297113fffc0c4380215119b6beba4306e1069cdb SHA-256: cf585ff65bf884b8d630b50e82ce358a4dc2067af048a924be95b33f67cc6f0e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The sample's structure and URL patterns are consistent with a malicious document delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745b0aeded7---19021963122.pdf In PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161276b57b9232---16908169008.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/b514227b57eb69826d11748adf51c5bb/xisuzinojomipuwizezalux.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/88927309896.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/vutalex.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/54df6a3aed02c9b26898544359cea9d5/47079282663.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/kekilutipujuziralimos.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/2189483020.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/bofipubereg.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e866cabfe---tazebibolezir.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d992350a952---bexixewosorivusamo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/99195f590d53d3ba2bf02e4b29e5dc9d/paropaxosunolenewu.pdfIn PDF document text
    • http://floramarble.com/uploads/10296760400.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/e86a3cd66df3c420b8a88eead08013ba/13021065954.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cb0c66c8---totepoxes.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/luregubivazolubizuno.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085964169cf9---bavuri.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8b6a9e7fe12f5a0b64856353afef8651/xijufakatisujiromekowu.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/52957391214.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/tobevitukiwumixejila.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6350vtsj047e4tvlec0rdp8aan/tulozonunakiwusafiwu.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/tuzod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=example+of+methodology+in+thesis+pdfPDF 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_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 17044 bytes
SHA-256: 35cb8eb1059b6f2f5f787b5dd564129e107615890e4238111eb299856346d012
font_02_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 11044 bytes
SHA-256: 096080b813a53c6edde6cdcf4fbb0291c0d4c6ada820dce3b8be1eb30ff89d12

Open this report in the interactive analyzer, or submit your own file for analysis.