Malicious PDF — malware analysis report

Static analysis result for SHA-256 0659d4465dc71aca…

MALICIOUS

PDF

90.3 KB Created: 2021-07-28 02:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf33bc26e8d19972e5eda79fc6861ff3 SHA-1: 8a50ef5b3ae099234d27c4ac55f1d6404842d0b3 SHA-256: 0659d4465dc71aca390abd26db59fa5f30368585a3bbe4a6858867c74391d8c7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The primary attack pattern involves directing users to these compromised hosts, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16070784507f5c---90886500309.pdf In PDF document text
    • https://hbfilm.ca/resimler/files/telewijasilobum.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c243c637133---56911679659.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/53824656744.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609654be305db---19586399491.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6fe7b2fe083a7a6f56e5f06869c28f5c/nareleridugemifizu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29bba5dd4---87283732301.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/fozupamugezogufusataxet.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/21303551766.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb0ce76a92---femuninerazoxavax.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ed0f1d90---wubonoludefolup.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/buwigusopugeta.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e33d093e67dda8ef2b6b34080cf2e6db/85328881241.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d3e3125fab37a0cb5479e22e57a90f1d/rigafatujepinetorukoxusi.pdfIn PDF document text
    • http://sns.hu/_user/file/55085277316.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/dosigomonuved.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/596456359.pdfIn PDF document text
    • https://webmenuplus.com/images/file/60423641545.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/01bb225be8f608b06a043d67cfe21661/taboto.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866968cb199---fudoravujipitiwe.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/5drq3ioj5i0tkg68gr0sf66r37/lawurulufirol.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qol5rs74rglfci61kuvqtuoec4/34079148193.pdfIn PDF document text
    • http://surausa.com/uploads/files/92528838715.pdfIn PDF document text
    • https://chptravel.ir/data/file/rutebepizabax.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/56000381382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=damarukam+shiva+shiva+shankara+song+lyrics+in+teluguPDF 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_off0000fed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 11052 bytes
SHA-256: e83fab8947700f7c153b5c89dc006add36ad77845838772779d52523a481b9ce
font_01_sfnt_off00011869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001307b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307B 16476 bytes
SHA-256: 7a0e9c66b5ffdceee99fb1325a85b4d05a446dc4714a2dae85f921cfa7fda17f