Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87bff2e9a6753c2…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 10:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e52b3c6bbb1d3ea7d7a5e94501d90615 SHA-1: 578f5a13b39ea354106f2be0eec60bd53862a929 SHA-256: e87bff2e9a6753c296f3036eaa8cbc31f5794da71028c7bc074b3e64d23cb88b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially harmful websites. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://garglob.ru/uplcv?utm_term=san+jose+nueva+ecija+zip+code PDF link annotation
    • http://ambvetsanprospero.eu/userfiles/files/98463749939.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/70802268765.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8207e3b0a---nisatekubinuminonaz.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/748dvvf2a8gpetvrqm68gd1856/vedugodasemawofikibil.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/77875824714.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/40390729991.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/94658531166.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/mitibelevemad.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/vigenoruzegul.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366dc6b2cd2---3056270144.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142124c7d31e---91926961408.pdfIn PDF document text
    • https://atiksigorta.com/files/vadotoxijunemogijededela.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/47683304786.pdfIn PDF document text
    • https://khanikango.in/file/xugowafis.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/bb05a6d433bc5456a05673abc4d8935a/45286412281.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/77186757373.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f026c41f---fojuguwovipolibusenoboji.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/fowaga.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/11387988046.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/cdaa08723d4d520e7582aebb67deda3a/92906428666.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/35289014873.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/44511433148.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/xumexamibenosusalu.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/kenepaguvuta.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136d39bf2549---jupopuzefutirakiz.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_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 18060 bytes
SHA-256: 146bb1a48bb1f44aa803109757beedb935f67e2c249cf7b90fb5f33df38d7f25
font_02_sfnt_off000133cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CF 10696 bytes
SHA-256: b63ffeaadacc53ff49bbc46782e8376baab3e768c75f26225d63dfbcf7e8e055

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