Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f78f5faeb08b6aa…

MALICIOUS

PDF

93.4 KB Created: 2021-09-02 16:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7e160a65a8813b2c4b5c46cf99b50293 SHA-1: b5039eb1641b01c6ecc8021cd6cae972780fd4ca SHA-256: 5f78f5faeb08b6aa1511b6e26986aa316f7ea4d96ca77bc0870fd2f8176df74b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://drafthe.ru/uplcv?utm_term=affixes+activities+pdf PDF link annotation
    • https://www.hsbofmn.com/ckfinder/userfiles/files/nubagifuxubulosituvu.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/pejumabop.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/jusuzigikowusun.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/41405070986.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/pazubin.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/sugufiradijar.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d29a94c3ec2cc1fc689326c20f4e56a8/68760065889.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a37e5cfb1f3f02bdb465a3b921ce8b25/vifesasanowivepovapogisi.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/27110125609.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/fezawolufurovapovofejuw.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/vunufanutusagugutifa.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/lijoxivawi.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210611181839_xirmwg.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/jezawanebexamowuku.pdfIn PDF document text
    • https://advik.net/userfiles/file/dufagubola.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3f74c9f1---18409449215.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16127257a4b0c2---maxibozezoriletolalavonu.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/85291897716.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/25667841938.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/tevumijagejexajab.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zilur.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/75693442685.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/detadilasixelidixinawoni.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb23088ec6---livexesunikoxejurix.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 10392 bytes
SHA-256: 811ec88768a7915d4fa9e5f308c429deabfdd719898b719b4f281794d33e3867
font_01_sfnt_off0000fdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 23072 bytes
SHA-256: 3b653c4cd68a3fd7ffa21c8d55a10c1881a893d2a0aefd65d348bd44af6459c3
font_02_sfnt_off000139fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001520d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1520D 16148 bytes
SHA-256: 1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78

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