Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e08cbcdc9080ef1…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 20:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b1a318659532db0d61680373d360999c SHA-1: 18fc074234bf8c07307f283a769736f7a356ecc8 SHA-256: 0e08cbcdc9080ef1481c01f7bdd25bab9b078567a62c5034a53a79da7bff31ca
156 Risk Score

Malware Insights

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

The sample is a PDF file that utilizes a link farm strategy, hosting numerous links on potentially compromised websites. These links, such as http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3672a961---rumejekef.pdf, likely serve as a lure to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://restaurant-lyons.fr/userfiles/file/vipolobasukarunigaza.pdf In PDF document text
    • https://zebcom.in/userfiles/file/gegefedirenilem.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210907225508.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3672a961---rumejekef.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/wowivajopusuruni.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614006a84d9a6---88831387477.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/26457020992.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/23938773756.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/39138980510.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/kodegupufogagupavisolez.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/povalagudefaku.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1deaf3ad3d87e4ba3de023f985aeb050/junosusuvenajaru.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161327d5f894ed---sanikepupov.pdfIn PDF document text
    • http://ipceurope.com/assets/file/93161442999.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/42673100192.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/zuluvimafosojutasa.pdfIn PDF document text
    • http://olympusflights.com/files/files/fojimenuredoseter.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/47941437536.pdfIn PDF document text
    • http://camonetinternational.com/files/file/36506824593.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/zitimidegulosegijopozemuk.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/9984001668.pdfIn PDF document text
    • https://digireg.pl/upload/meximuxijosuvikumeboka.pdfIn PDF document text
    • http://chapelguild.com/images/usr/fizesepezopuwajaxufubus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+spaceflight+simulator+1.4+full+versionPDF 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_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 17372 bytes
SHA-256: f50b6312d69b06e532411c2945dc0477d4a42de7dbc25bf80e451a5fc0566721
font_02_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 11516 bytes
SHA-256: 064048a68758919f5754424971d6b0873cc6f3483f75a79992c3f63a4050b926

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