Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c3e09df252dbc5…

MALICIOUS

PDF

105.6 KB Created: 2021-07-29 19:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: ec2027f351597a2aa88cdd10eec1c7f4 SHA-1: 6f17d9614fbbf42c16b7e4599e7bd1d21ec371e3 SHA-256: 12c3e09df252dbc5bcb92bb8cabb24173101a23b98cac0be8a432baadaf6caf4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites, suggesting a phishing or malware distribution scheme. The file's structure indicates it's a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://medvor.ru/uplcv?utm_term=ejercicios+resueltos+de+peps+ueps+y+promedio+ponderado PDF link annotation
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb43fc3f005---89709533289.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845efa3d9a9---xijitoxafi.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/1a2b70bec31cd76b345ee16f963bac60/xifivifabilepa.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/n0i7surn7v3rfgtbjnguvsamn6/28231777385.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/6i1rtr6niatu0jq5e89j1bahbn/36615547017.pdfIn PDF document text
    • https://begili.com/uploads/image/files/kejiletiguxun.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/69107972369.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e47f2130352f625a19e3b8d9744665fa/zifebewuwiluvunovemifiniv.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/kusojofifesipativi.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/83979628666.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/257tvqrcqg9gcc1p210ggpkthn/vukawipikakuma.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63d18300af---nolavezu.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/navazute.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/43391052683.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/45035397802.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/99095174286.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/xetodegizamipow.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/dolunikomomopegasukepetiz.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/3733e4575581966dbd73d7c2cbead3f5/zopepoxadobowowunovej.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/nikisokuwadolu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608521bc708b5---jizijawowex.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/uqnp7t1qj4lblrf84ckjjlecmo/zifilasogojukugalaro.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/df6a9b08d3c5c94166d47e56ba9f8fb1/18958984678.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210504131824922.pdfIn PDF document text
    • 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_off00012edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDF 20888 bytes
SHA-256: b527702ed4c38b5a4a9807643fe235b899cc42b68cc514b12798fbd4a280a6c2
font_01_sfnt_off0001649f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1649F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CB6 11000 bytes
SHA-256: f20da5fe5691fa09c908ac267233fb77369a9fbe7fc9ad169e0cb6f92638b460

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