Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd009d3b7348b41…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 12:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a459968aca185f25b2abf97389267aaa SHA-1: 76b00917a92f45b4230028ce1d7ade4c7ec30751 SHA-256: 3cd009d3b7348b4183d5b5a02ce7256f3d58c1384b0790340b237b2abf4c8e29
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://likeevent.it/writable/public/userfiles/file/36289581213.pdf In PDF document text
    • http://forglass.sk/userfiles/file/17435782618.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/70174462499.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160901f34a1a93---pelojifofokux.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/99095391675.pdfIn PDF document text
    • http://khmer24biz.com/public_image/alluserimages/files/39226197137.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5j3tovummeeamggntl8ktg9rgm/24434493590.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/967b4ed2e2f6619414869b65ce33485a/18813103079.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/xajugumorajibun.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c4bcdd22d---33643633700.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22668116460.pdfIn PDF document text
    • http://beateromer.com/bilder/file/25827595571.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/67587590995.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/negejapatorovizepakew.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/e4871e1c83d0654eedb34da28edee3ae/mekubibawirugevoriv.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/lupevugikaj.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763b3b52719---liraniburidupuninokireb.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/ninofanopafeloxuxol.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f492e254---gimotusesuzigakedikit.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/10803073533.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/zagobupewifubitiguwipik.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612bef4be4d11---28615562289.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc5648b159---5560451398.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/junofo.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/lijanobedupejeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=summation+examples+pdfPDF 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_off0000d26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 10836 bytes
SHA-256: d8d6a444de19124b1c3869daf8b81e16103f8f0e0d6ae21f4407d6f6cf57e598
font_01_sfnt_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 18444 bytes
SHA-256: 33719497f8b282bd0e7a15ae01184c12e5a7ecebfe798a4bba4d454396f89e74
font_02_sfnt_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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