Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d891979a4f12cc7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 04:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a7a3c28e19ddc4f3610ac5650d54b55 SHA-1: 353c831f10ba03d1f0bc0b19046c168887e9431e SHA-256: 0d891979a4f12cc7d5a28dfc164c19b322d33293a78157539caf6ac4e6e7b408
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for further malware or phishing content. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=matched+by+ally+condie+pdf PDF link annotation
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608de2886f5dd---84347247122.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/gq16q6f69a15i6aaeea1idr1il/juginalotimumovadimezu.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/latigodinuxonaxunujokak.pdfIn PDF document text
    • http://robbes.nl/media/files/52897891555.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/bd4200d176653ff0b6d15d07273e64d9/danotinopov.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/u38f2ic2mgn88bhv8lrdfft6lr/69176322845.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a7fc72f71---karoduwipedimizipewesu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0966523530---22372955689.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b724e59d1---retemazusen.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16123e4e17987a---jefawafexebalusemix.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/merapifibod.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/rabisup.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/pesusalugixulowe.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/27734605745.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/12691060005.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/0mvgelb3fs3pio70q6fpc03dr9/14148445212.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/16912275216.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/81682520846.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/wabuveborigefa.pdfIn PDF document text
    • https://777mto.info/contents//files/72019507498.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/viramasivukaduwip.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/jurodagolakowopisupipupu.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/lutime.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-5/20210505190636784564.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/78370141262.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 19748 bytes
SHA-256: 0b5a3f628f83473c9794bb11c9c2c85d7039da3318a73b237fb1ef2ddb1b979f
font_02_sfnt_off000129b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B0 10696 bytes
SHA-256: 988fb5814467214aca5e849a8c6ad1efc527682d968f4d4e4e7e25f5af8a8a70

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