Malicious PDF — malware analysis report

Static analysis result for SHA-256 9888f76b019a4581…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 00:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f1d6a156a40f9700bb7e5618aa62ef6f SHA-1: 7cea1480b0ab4b6838c94c707c3022b1bb98d537 SHA-256: 9888f76b019a4581cb9e3c9625a84bc269ec6bacdea10d20195dee79da097c78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=gta+5+for+android+apk PDF link annotation
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/forijomawarekileb.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/vawaxuniwi.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/goxajilodavesodapawiwemed.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/26163022645.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/2sdc403bkh5mv69siufo2a32d4/xugomuxikimage.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/4109994225.pdfIn PDF document text
    • https://signika.pl/Upload/file/sevalejurupoza.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16140ca585b040---xepanoderenedarefi.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/lezopetujukebalubij.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/77516122232.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/13949475382.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/bizajofufumemal.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/juvojarebesojolex.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614af723e1ace---duvimomifukafidepabutakiv.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/90056115002.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/watix.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/75580908184.pdfIn PDF document text
    • http://ed-union05.ru/files/file/11019687250.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/saxize.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/60701701327.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/19258589008.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614435ea4edbc---95016320583.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/lijazipewifabim.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/fokaromupi.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_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 10412 bytes
SHA-256: 0b05a7298be863b4f4f2d16781a2e973be4f042567a37f39316630a773166358
font_02_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 18020 bytes
SHA-256: 75589996244963f05166cfa60fdd31714466ced237578997a2f902cd1db5772a

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