Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdbaa238b4ee3a5…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 23:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ee4a2ba55e1c41772d0f08a8428a41f7 SHA-1: 238601091e628b333b52086137d568ee607d8d9f SHA-256: 4cdbaa238b4ee3a5398d74073431e0648d8996851c714e23b74d22077e372906
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions. Additionally, numerous heuristics indicate the document functions as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads. This suggests the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=my+phone+ram PDF link annotation
    • http://mariondhuique-mayer.com/data/file/zusiwofaxodugevazera.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132909c4a9e8---wolatu.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/gemixojipiwekuxidamojun.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/82425791104.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/88099628861.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/44808509749.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7cdc8c847dddbc10053c7a6441546243/zupetoraruzesozetinod.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/21802723127.pdfIn PDF document text
    • http://baove24h.org/upload/files/35413083333.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/fexibipajelevunubanamuleg.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/53141852717.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/51370216600.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/kuvibekosemeret.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/sojojifibor.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/73375638086.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/eff339ebd5a6f94c4a446cd46859043a/73795195824.pdfIn PDF document text
    • https://mattress-leader.com/media/xisajezakug.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/xoxijakog.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/64506713166.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/40934373816.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161389b60d945b---jazazexefapemo.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/70655594281.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/jedapifepananonin.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_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 17220 bytes
SHA-256: 7286f212057dd9948f0c30616542e68f8fb0673b284364778962a64a23669728
font_01_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 10220 bytes
SHA-256: 59ac91cc911ee950ec2793e1c24253d43c5513c8d2bff57688168efc64760194
font_02_sfnt_off00011e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1