Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8571eb01d7bdd5f…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 13:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 270799c0bbc00757722af6e84e80f53a SHA-1: edc8246140cf05445eecca37f4df73d9ca1d96cd SHA-256: e8571eb01d7bdd5f5fabe58e9bd53ea8e80a7692af277c0d5749b6613ccc11fd
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 as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=verb+to+be+practice+worksheets+pdf PDF link annotation
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084089ab2f9d---timixajideve.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/uqrooe6fcbn7ekv2h92v9eq9l5/lagexojitisuk.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/wugajexubuxapogo.pdfIn PDF document text
    • http://edgecs.net/documents/purem.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079eed414d1d---vasowufopijijutimonumaxog.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/zagutujifizetatumunade.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/95893680770.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/turuwadikuvi.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/280dbd67e01a128329faa9815b1fd9f1/31713991391.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/73527335485.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/8c244fd065ac950d42da515dfd11e554/11087469290.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/88686583693.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b8a319e5e---pelodonajosarofewedubu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee4ece968d---gewinesunupenonasetos.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/ruzebuzodatepadibapigofi.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/fpj45ttlk7r0i6u60m8c5nackj/18312390969.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123599e14016---51519438037.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/qb6r10j16tuni5f0gbrktnk8kj/tunuj.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/99795fca802849fb67755643052467b9/sulojibipozunifominemumek.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083613b8cc29---dexeramejotozuli.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/bbd25ae8464aa1d6ada02561d3f219b2/texirizabewujuworesuw.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/44673985260.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/jizipojagakudotat.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/28091dc9dbd00fb4540327c562703417/96759021009.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_off0000c512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC512 17460 bytes
SHA-256: 5df04500ae21d8c6aeb84742b1898924fa7114a1af578b2db995de7518a6b986
font_01_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 10856 bytes
SHA-256: cebb9ce4631afa1eff2ddd872dae06392119d28b54cb214905ec2858b30813f7
font_02_sfnt_off00010b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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