Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0dab28ebe65441…

MALICIOUS

PDF

89.6 KB Created: 2021-09-06 16:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 38e81de0b761577515e6b6621ed246ab SHA-1: 43e72123a4938211cfd61f5f905d8c7a2bd5ecfa SHA-256: ff0dab28ebe6544154b588bf637346d5f280f2b468e5b4fea6df78dba0bd0d17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely used as a spearphishing attachment to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8b3916e3c1c2d65a65b7f354d0b93058/sofozawopagoxolasenidijub.pdf In PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3a919889---tekisixikedemuralujuz.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/40466940081.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/mumet.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160959fdebdbb3---vigakuzub.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/h9e75c7tounf7sjsb667lg3t1o/bezigawunozam.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/077a1588cca722f1c59b21651d77d974/xarejerapixuxuwebaju.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/jugurudojoxegopolixigis.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/74954294932.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/20295895538.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tibuxivajukejitopujif.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab102c174ad---wifulabuxefubizani.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/88021849506.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/pisowemudikoxedavo.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/63969816767.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ec5d3f59e---52991480039.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/tadoritamasezil.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d89d8fbe---72686608326.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/29152937621.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16077436354374---80485587628.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/6246359570.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c627f56433---51481504968.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/99341709907.pdfIn PDF document text
    • https://p1gtac.com/uploader/files/vimesefegakafumowi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4ffb5108b---69153620213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=merry+gentry+a+shiver+of+light+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_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 10948 bytes
SHA-256: 8f57b985fd94c31b956208868ba45c2a380c2cc0e55b081057e19bf43ad15d42
font_02_sfnt_off00012805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12805 18852 bytes
SHA-256: 98c1e6de132ee2b3abb39c240cdaa29f3dd555b9f8dc1b07b16d8a3d7216177f