Malicious PDF — malware analysis report

Static analysis result for SHA-256 c025f764c75d9652…

MALICIOUS

PDF

86.4 KB Created: 2021-08-21 04:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75b11ffadd54f3abecd1a835197d9d6b SHA-1: fa4d9979632b94efd99fb561ea2a0222f525cacd SHA-256: c025f764c75d9652d2cefc0f9eec7d80b3ee6e4c265a8779890ff9c692ac2c4e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_RANDOM_URL_LINK heuristic suggest the document is designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfc9f5bf93---5578625508.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b132b015f4d---kavorewenivaledobesir.pdfIn PDF document text
    • https://aicsmindia.org/ckfinder/userfiles/files/68021351535.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/88312240698.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/wotujajidenaturalud.pdfIn PDF document text
    • https://isosklo.cz/uploads/vugenexapajalefozuxupapo.pdfIn PDF document text
    • http://preiss.at/upload_files/files/27478739016.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/kibivipagave.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/naxutamimerusitubet.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/juweritoben.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc88699a38---16896977438.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/f61ea082561dce4b91303e45ff5be37d/28034644240.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/os2knvtqooouauub8b80hi7qcd/vonemefutejowug.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/aef196be1277ac940d3fa936806a50a4/71842128600.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/rovupigibobaditula.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/solazevafupofiwanowow.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077744cab782---28734336476.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/89837316693.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb1950669b---xuwejutitilojisuwatili.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc218d45472---49003996896.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/vakip.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/losebaxifedo.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/86130737674.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210728173408733044t9byp.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/croqpcg9vus8dtd1s8sic8dgbs/bowukudegeb.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e9fbecaaf5050bc33c322d8cd2437b19/23519298681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+unblocked+games+at+schoolPDF 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_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 10960 bytes
SHA-256: 6c1c8797b24bf6757f53a39a1fbd623afb64c33de84157cc895cb5a3efe20059
font_02_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 16636 bytes
SHA-256: d420a1df75f08d12e27cbf42b1d282f853b6a551ab067b3d6b9f8b7ab6d04288

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