Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef8ee73ebb2ddb6…

MALICIOUS

PDF

84.8 KB Created: 2021-06-27 12:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db3dd91e39cc49b0cf8fab3af6c015cf SHA-1: 88fbcd935f44b297a489d60a65f57350ec14411a SHA-256: 9ef8ee73ebb2ddb625a3dd8430566b3f3b411af7cfc3687046c6e87271e03170
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of 'utm_term_redirector=True' further supports the idea that these links are designed to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9b4df42faf1d686836cf9026a6e3478b/jipukabimudan.pdf In PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607729c579483---fifobupozeno.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/xonarejoz.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071043b3a914---gilib.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/62091285878.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/xibup.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b72c2f9878a---6063600158.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8340385f50d37c2640b20eb43bf38231/jobuzigi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/51735a3b04663563efc25722302b5514/bukoripawoxukenasegi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1c71f7f9a1f35fefbba88ac33dfca1dd/3357203918.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c14b337f508---55722620514.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fd6c0d93a---febapetogi.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/ludozufuretuvubi.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c52be5f2175---texamawavokokutijazer.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97e602105---10048263577.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/27753510340.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/75402477216.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/db38df576b0e66a69ab0c7bb88349ec4/62956861178.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/isqf2n0027a8b6hf6nkhfnhfc7/19348344140.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/lh0hdfha4dkmlvhgp8doo912k1/61467198771.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/todipivurewivorov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=physical+and+analytical+chemistry+pdfPDF 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_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 10880 bytes
SHA-256: 3b98bba0a7b824075842368be082efdd581961eb303a909e21c16513237143ba
font_01_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 17860 bytes
SHA-256: 66ed7f1a41354a888618fab63365cbf9c349e58d10c7f0a2ed9df2b333fd02b3
font_02_sfnt_off00012e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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