Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5edf75735899c00…

MALICIOUS

PDF

88.7 KB Created: 2021-07-31 19:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 604d0a2b0007e3ca1b750b5e8892c3d5 SHA-1: d4a09a1baae867b2afd7743315cfe8711abe9c67 SHA-256: e5edf75735899c007b6cb690ba98add610f8cad928247761a8d1278a6aa06de9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://philabc.ru/uplcv?utm_term=sharp+aquos+tv+user+manual PDF link annotation
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/osa430iu2mm1k6koliedukfc1e/derujinimupelarivolodoman.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a69ba214---50926452700.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d996f7f1c2---82410553878.pdfIn PDF document text
    • http://teplospectr.ru/images/files/lejaxifikudig.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9695bcad8---lolibi.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/29571403135.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1624559946bijilimibuvuko.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/jegajuwisuwe.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160791f803a6d1---dadizolojij.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e9a512a222672768ff60378f46021aa7/18136732609.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805951931b5---tululakofotumurolesa.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/20187678741.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb4b6496e---74024039640.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4780067a16abe7c84e461e61feb03b2b/mexot.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/fb48f0f0d17d5c358862425a1d861361/gezabubigufogudonijuno.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/4341256579.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb10a1c6d---detolobif.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/85ea00f17192c1c4fad7ccc5f645ef92/77539149919.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/gudoxituvodigabab.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe1f4bc1a2---newefedebagelinobopemo.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/lakosil.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/12729849626.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/41930118585.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/84051068668.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b7b72d57c---daliwuxezazel.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/u5kepq4higp7u1kl2rdjimghku/tujoruvasipipibivi.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_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 17148 bytes
SHA-256: d1a1989dc496e92104dfd330efc939e2a5468c16556a42e73b6e8652bd3c8cb4
font_01_sfnt_off00012423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3A 10812 bytes
SHA-256: 346aeb6e1efc7ffcfba186fa6bf4c50e5921ae1f6e36ce617a9df51830f13aab