Malicious PDF — malware analysis report

Static analysis result for SHA-256 e596d10b7059e2f3…

MALICIOUS

PDF

77.0 KB Created: 2021-09-17 11:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba340d5db85b49c44e60e6c5ff80faca SHA-1: dbd69d6d385a9295d9c286775f7e647b73eca7c9 SHA-256: e596d10b7059e2f3a58910c8a39294c8ff4a9191f878880054036af86f23a38f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The primary attack pattern involves luring victims to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=how+to+transfer+file+mobile+to+pc PDF link annotation
    • https://www.campacinter.com/image/upload/File/12947048292.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/23299959062.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/zuloxotefovivoxuxilaput.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/48389083825.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/doluta.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/35553279505.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/39905556846.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/aonraq126fl107f8jq9u8hc280/79276001076.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2c76278ec21a7b78179fffb162dcb9d1/zejalinapufavazo.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/27d810971254b0ea285e3bc278ba1ee1/lagewo.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d05a88a43---96152726840.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142693d1d5d5---14597189164.pdfIn PDF document text
    • http://geraldinekilkelly.ie/pofirelamifakevofavive.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/nopezeketen.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/66429249959.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/tizametibalikugujolu.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/46069066885.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/14784535444.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210914081842.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/gamupabisesenepuwudup.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/99061175552.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/difize.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e922bee221---mupasirokez.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_off0000c9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B0 17076 bytes
SHA-256: 1a76df2ceb1a4c44fe80180720292395aa093582e1a346a33832f57c133e6bf3
font_01_sfnt_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 10860 bytes
SHA-256: e34085765150249492c3185872f5038d598fbd90366fd89007c281bb740162fc
font_02_sfnt_off00010e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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