Malicious PDF — malware analysis report

Static analysis result for SHA-256 875a3eca7b6fcaff…

MALICIOUS

PDF

82.5 KB Created: 2021-10-19 07:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ee24ba7eb52005e18d644dec43cfa0d SHA-1: 4e6dd52d90ec57b891e7628e1fb960b87fd903f7 SHA-256: 875a3eca7b6fcaff379b9f8a0dac940c3774479cc8b7a2d3f51868b346dab0f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious document.

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 http://p-itos.net/admin/userfile/image/file/muzowegeloguna.pdf In PDF document text
    • https://k-newsletter.com/ckupload/files/setigubigipidawesaxi.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/72225746690.pdfIn PDF document text
    • http://nwmanagement.ru/generic/uploaded/file/gajigiseminu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1616debe9c18f7---gokazovinizidazatapop.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/15781457230.pdfIn PDF document text
    • https://exclusivelimoservice.com/ckfinder/userfiles/files/sepowasisa.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1615cdb41cb58b---47769543964.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///51042820496.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/metipewipovowogemaf.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/df5d2517c8681c5063a732a856822274/kusolu.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/7610558572.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/12294756522.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/lamutezexezurogimo.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/sazuguvuzifoge.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/valadubunusoguremod.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/bupineranovub.pdfIn PDF document text
    • http://preiss.at/upload_files/files/fiwuxuxegeloreloxatalufow.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/82398265676.pdfIn PDF document text
    • http://fnathservices.com/upload/file/60160161038.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2208bb6f6a6aa096052ee21912b935a3/vasoxovukuwarefu.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/penuwakurenazugu.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/jeweneviw.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/vibutelusone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/UsNeCLCzgYg/uplcv?utm_term=thinner+this+year+websitePDF 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_off0000ddb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 10344 bytes
SHA-256: ffdff797b3246469d99413be29dce37cae5871764b7cced462588f5cfee7f420
font_01_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 18776 bytes
SHA-256: 2f42264ec15c7cdf295f06706f5e321bd4c95409eee723c8b6265495e88d5a68

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