Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e912a849ed93a31…

MALICIOUS

PDF

85.1 KB Created: 2021-07-18 02:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd4d8cd7a408b8583bea356313fa3032 SHA-1: 6d3ad02a5883a27056f50fbe3798c54d43023ff4 SHA-256: 3e912a849ed93a31e07e0de2be452a32a7e0a716af6cc695afdd6cc2fc398028
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a35b588f1942d68e49056b1022488485/93391374817.pdf In PDF document text
    • http://short-story.ru/upload/file/jimokogewojix.pdfIn PDF document text
    • http://sun-eko.eu/files/file/setelagugoposeveradu.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/nawunamenonavafotul.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/569ca22e0f789a90f68e0b9954ef9524/xebimesotimidutazojoweno.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/tisomipowelobipakon.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44221486353.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e033f361---20038363367.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ak7r4bqt7o77hgrul1b3eds0p7/lebisofonomuv.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/26d622a1c6c5aca5e0cef38f834304d6/41286248554.pdfIn PDF document text
    • http://hoctienganh123.net/upload/files/53628744767.pdfIn PDF document text
    • https://everestart.com/images/stories/file/tuvoxo.pdfIn PDF document text
    • https://brod-plovdiv.com/images/66759655239.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/b21a1209bc9409bc6ec97bd461f18d42/98460942436.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/71426903590.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/11082374869.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/51920672731.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ede81c6c81d---51932068632.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/e24gl2vtfsvau2p1ad1cldjtbe/letodolilekaxapepuvos.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/30664813108.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/3ltq93q8uood68dv167uks9rqq/18976174314.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e14fa73e320701165a222b9d159f00d2/ronawibuwekuvesirib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=muscarine+mechanism+of+actionPDF 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_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 16456 bytes
SHA-256: 602ed4fe8c540378c1440abf5ced08c3291e8da2e3f98f7b5d48e91e6f02aeef
font_01_sfnt_off00011710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11710 10648 bytes
SHA-256: 8fb98efa0d10ebc4ec13aedcb7780fdc3af33d8f69f739f197c09efcc7b7ca7e
font_02_sfnt_off00012f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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