Malicious PDF — malware analysis report

Static analysis result for SHA-256 55efff0b7df0661a…

MALICIOUS

PDF

72.4 KB Created: 2021-09-01 16:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b8180c4afa469c651e1ef96789647c27 SHA-1: d7efde4267e9841b6c741567d8cb5274ff57da35 SHA-256: 55efff0b7df0661a220587ec11096cda5dfda20ce45f3ed9072dc22d1616fa99
196 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect the user to malicious sites, potentially for credential harvesting or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a524de62---verepumujojos.pdf In PDF document text
    • http://altaprecision.com/userfiles/file/76695555669.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/88386708164.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/6437971166.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/35278062715.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/22859319614.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/fisanibaromixinanudaje.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52dfc25a18---rerefavufarelo.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/ligipazagimolagolase.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/89830533032.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/mumumawaxim.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/bibidibugosuxorifupez.pdfIn PDF document text
    • http://fitviewer.info/files/file/jomulefowijapozuv.pdfIn PDF document text
    • http://dfanchem.com/upload/files/81249044732.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/xefitofavixurazobiz.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/90113287893.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104659cc38c0---tavezatalusodaridu.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6092822c9---36890989338.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/c718c12a3771864efa396cf7025783f4/92671963462.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kububepeken.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b372feec44---2760487247.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/77527385972.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/demij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mixed+evergreen+forestPDF 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_off0000b7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A7 10480 bytes
SHA-256: dec5ddd1363f56cd9e29266d636ad13b46f9d37edc583b68365eb1a8cc767062
font_01_sfnt_off0000cf70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 16584 bytes
SHA-256: d0b9d45f35e36d5bb16334580c24dbf2111d27be0f75c6c51fbd70c9d1f17a6a

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