Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ec3a5c27a9fb59…

MALICIOUS

PDF

94.4 KB Created: 2021-07-13 16:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 324a1dd3a9bf8023b304851331201daf SHA-1: 773ff114c3ad7888d735b77535482cba57c2b353 SHA-256: 03ec3a5c27a9fb59ac51a2ee8171401dbabbf807a2b87ab91e9ef7a1d30bf4a9
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, indicating a likely attempt to redirect users to malicious content. The presence of multiple distinct hosts and link farms suggests an effort to obscure the ultimate destination or to distribute the malicious content across various compromised platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a713bba1114---47650697977.pdf In PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c672ba0b34a5a5907d4a81f12f554a73/burifimamo.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/gaguropokotagakofutobe.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a644dd06a2---sunowu.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/54319599844.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ob7sc9rdvr64b6l548806q4q22/faxukajituruded.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b46d46b803---38175122949.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/manesabewaraz.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/86557393538.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/wenepovominibarubi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaddc42c5f---zogirabuwezugiveguzid.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/b9t8b1qdtg2u3qha74st2dc442/vabaxefadewo.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/434b165a54e6ac4f778c9d83babb6496/gipamaxikitewew.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/b08m0nkmcc215hp15u245sfbu9/wunego.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/depobozisonevipovu.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/susonebibozide.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/jiloroxisugapobokefap.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/67727124098.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8acb1c168---zozawinusulug.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/migepaxamin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=city+of+moxeePDF 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_off0001110b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110B 10040 bytes
SHA-256: 7a0f3dc2bfe97ca245a3cd7ea3185b9e798f0c04fb06e4d8a936493d1f37793d
font_01_sfnt_off00012778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8A 17288 bytes
SHA-256: 158cad31fd6ee55e040192f25973ef968b8fcf5e163c7c54a9aa2b12ae5b1bac

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