Malicious PDF — malware analysis report

Static analysis result for SHA-256 28023498556073a5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 13:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb05ef6dc113530fbeeb5492aa616450 SHA-1: 9557eeb38ee07b46a1d382e953f4de562a25674b SHA-256: 28023498556073a57bd81d2fab7fc94ac6667f80d4e2db507214b4593b91d0a0
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and a URL that appears to be part of a phishing or malware distribution scheme. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=horror+games+android+offline PDF link annotation
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ac703f0d41c71383b50993f17dc906aa/suwijixuwovuvudobebu.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/tititirekezofanakofukewi.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109100359478337.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/62111545628.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613214bbb6e6f---41873161291.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358b03528dd---71501483294.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/6391421251.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/34007331145.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/91933321945.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/gobekewidiro.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/dunafatiwiliri.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/5863001593.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/fagifozuxexonam.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/tisukezodaseguja.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/13354972719.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/pujafijajajedujasurorub.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/37243275031.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/womezigupebul.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109171622586887.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/kagofamaduto.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/netavazowi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da302dbc8a---92504743990.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/52238031825.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_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 17612 bytes
SHA-256: 834edd6e5456bcda2f058dc0931739c6ee8cd7e1ef75931bf08267199e643668
font_01_sfnt_off00010e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 10588 bytes
SHA-256: 2b6799acec2552f94d9ef55af323de9323433b2c55169a62c3a374045616a7c0
font_02_sfnt_off000125fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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