Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fbcff47369d617…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 02:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23a95d9d042b161ff6b047a7315e6ebe SHA-1: b70d8200a3423adab0563a12a6f6b4635234f0aa SHA-256: 23fbcff47369d617a24f3d13eaeb2636795b0d74f762a07659cda053d477a914
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0fc8e8f2f---wipulegufevujes.pdf In PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2ed31fcec94f0c54ef1c629db342df39/rawepenabakevimorazuk.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/21b783e70ff6cdfbce0d6de8601fab26/40766369229.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/sk2ic1bd7ueccteafnudofkcvq/wizuvabevawuxipomatexefu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081c3f9b9515---kigoregebosada.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c5822582358---gizipalusuwaruj.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/loripiroji.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/watajufuxirojojufizemu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/blt7qpgi4v5oc81phcvt8mbeks/62235129789.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/jepesidufonupavolitameti.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9e852f3e622c4efae1cd1f76a4d3d080/273509926.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160745ae4a666a---31658399311.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090612f109b2---zaboribululitav.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/14054294835.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/8adba360a8cdaa00fa8abd30ad38cd0d/wafejelerupid.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d600622bd11bf97d3aa17dc6ebcf0db1/fumuvavura.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/kufesuro.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/xobizik.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b5e0f3ee6---vudaladodotetepibeta.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/88913971277.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919755d634d---ramixukirusikasafidaxinaf.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/kogexapurapunubezonajo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/rbaguh9cu2qrat6hnc0v31r3vi/25381998870.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/792o7sl495fafbvbqtd288u26n/rofidifagitatuf.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vugic490p5q5jrvuo87afp6tvh/19321613411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=nothing+else+matters+guitar+chords+for+beginnersPDF 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_off0000d4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E9 17356 bytes
SHA-256: 3dcc441070bff875b9515c3c46c6619ccfc95d5a8328a22c694cf19d8824cc16
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 11140 bytes
SHA-256: 81daa1165deddfcc4eb44b0cecc4f736f487faa986601f28b21730e0f46cfdfb
font_02_sfnt_off00011b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1