Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5838e4807d96e1a…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 17:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7c6312fc1cedc3aa99b6df740990520b SHA-1: 465b894a4a54717f8ef8c84ddde9fb2e112e410e SHA-256: e5838e4807d96e1adb5c826b48f28d1176dba6a379ee6f80a709d4f962e8c7e0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=how+to+make+a+brontosaurus+saddle+in+ark PDF link annotation
    • http://ksnjl.com/userfiles/files/batelar.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/xukuvasopuvebarariwuremon.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/zitujezajijavizipogobesu.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/5574225549.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/564bde08c85bb6729169d030e6581efb/gupatozadumatimosorawogo.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/werogejabujepirupe.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/pupujofogezisomabalewawi.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/parasaxogesowawopodotijaj.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/7274895065.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/ketevowujitovujinixem.pdfIn PDF document text
    • http://asustainable.com/global/file/48445509637.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614646ddbdc3b---motazogime.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/22175575672.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/tijoful.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/36377372808.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/198540958.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161507cf4e1a7c---zapajovenum.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613771ebaa8d3---11592890232.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/79632417914.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/59268150057.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/39759070268.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/34637980936.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/79951114181.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8697mpatgsijlhdlrt16577n54/jizowimajon.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/xaxuk.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_off0000b44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44A 10820 bytes
SHA-256: 2480e12e25a4213f8b0aa2c783bd8a41cb4d58916635500bae38e6c3c4f78dc1
font_01_sfnt_off0000cd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD31 15368 bytes
SHA-256: ae98ca323066a4ec7a29527b9e0ff21d8cd3501c42caf7d4701430e99aaedff3
font_02_sfnt_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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