Malicious PDF — malware analysis report

Static analysis result for SHA-256 f603833debb33a7a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 20:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d8c1494f77caa0d3febd2c9661b9bad SHA-1: 004392a2abafe61681ee50af90a5477c3902e091 SHA-256: f603833debb33a7aabac9d0ea512018bb7279a0b86463d9a3be00835e370b2f8
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farms suggests an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://wronba.com/uploads/wysiwyg/file/56009428670.pdf In PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613012ff23f3e---notesobekopajibivomalas.pdfIn PDF document text
    • https://dm288.com/slicice/file/21099117474.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/xozokemowuruzakevotupad.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/66510016544.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d5db04e3f---gezowex.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/86978637172.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/29511980737.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/30089401842.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/41299843352.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-19/cd120466f8bf2d9652ab785c840a2905.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/bojavotisimigeparaja.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/65259463807.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/lsaah2j1spffvjfr23abgjl6pu/42707576681.pdfIn PDF document text
    • https://mfdesign.hu/files/file/14211811433.pdfIn PDF document text
    • http://platcometals.com/images/file/18567079082.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/94991526093.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/livijotalafujujuzegebajov.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492b3c3f430---1215653423.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/tefaseb.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/14/75966558604.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/diduma.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/74886860805.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/xabafimom.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/31907046928.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/83810336422.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210907_C537B18AA588F600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=chapter+8+covalent+bonding+answer+key+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_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 11636 bytes
SHA-256: 7b54c25f8759f6b41d5abb6e75f5114f571589217a248a1e6aa524e75e065b2f
font_02_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 17420 bytes
SHA-256: 6eb1c35e7c8cd1c3062ae7f576452a5894acc9a6ff283214c52d7d87cc056cc7

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