Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee1271b0ef41407…

MALICIOUS

PDF

77.1 KB Created: 2021-09-20 19:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d07f3fa44cfaa47d4f4104eaba2935bc SHA-1: d1039b4f1050e8c91d11f9f9e59da3d955573ad5 SHA-256: 1ee1271b0ef41407e5aa0f798a29c23b06fa20544cec7193d5b949833dd96da1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggests it's designed to redirect users to malicious content or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a link farm strategy, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=current+cash+rewards+apk+download PDF link annotation
    • https://portalbime.com/UploadedFiles/New/file/85235391512.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/telikilofereju.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/wosupabenixulapoxeze.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/27314883799.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613a33816ed6f.pdfIn PDF document text
    • https://agros.net/uploads/file/tetivurerevurulan.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/lexiwotugesofuw.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/17747450492.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/251779007.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/14539531645.pdfIn PDF document text
    • http://halanmilk.com/upload/files/nogugokixon.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161383314b837a---3386073880.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/22423604699.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/31806353497.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dfa61195b---fojolaperegewaje.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/78995133966.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7f3e0e3722389d3d91c946ce25ca061a/66094195789.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/faparogifosawore.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/12513205447.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/iq3hvbfitsbekf6e3smurq87o1/kowagovezepozelimivup.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/5227862249.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/15911010427.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/10021126710.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/3398420307.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/defanetofagizopo.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/44703821489.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_off0000c134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC134 20000 bytes
SHA-256: 56fd1a7653c52af1bf9c190a02e2a6c807cb4bba67c74dd7a0e41ee5437f4c39
font_01_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 10828 bytes
SHA-256: 21eec7deb1c53c4a3c43a61ebb77287fef3b25c700826a1388c72d1a8d1926e3
font_02_sfnt_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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