Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3d72ccbb59faa1…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 02:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cbfdf11f460afaa151e440f7e3aa0682 SHA-1: 16133e2773ce1bff86d7ff7c7675ab253f424e49 SHA-256: 7b3d72ccbb59faa184a1481f01d0583fa5abbc20bb9a7a7e63ee2441d42659e6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites, likely intended to host and distribute further malicious payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to potentially malicious content hosted on disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://osteriadelcampanile.com/userfiles/files/xekotalemel.pdf In PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/98715aa57a90db06744a4ad20d50b8cf/peremigefetesud.pdfIn PDF document text
    • https://andana.us/files/files/43316959540.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921afe4b74---mujibedugunivala.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/baratawe.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/binawepiboni.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/26595265083.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4d1ce65794dae6e2635315b64ad301d2/93309723869.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161313b7e78e84---84559122593.pdfIn PDF document text
    • http://cissi.it/userfiles/files/9184803987.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210904141118.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-14/images/files/bunapomokabejojozitujesaz.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/83654181620.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/widijer.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109151824067532.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/jujinovomas.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/38423075811.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/90482671087.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/xunorezubupakowozisaveb.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/kukelinewemizorojuxu.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/46862349079.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/23142859175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cricket+best+game+in+the+worldPDF 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_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 17736 bytes
SHA-256: db5a571df201aae45344e0e351711874a7222e6b959a118720c2f96f7853b154
font_01_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 11168 bytes
SHA-256: b4df8dab3d3e24f29ce080c1dd2fa92163d23399d5c92d897f104914a0e106f6