Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d0e314ea078fc1…

MALICIOUS

PDF

93.9 KB Created: 2021-08-14 19:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36202b7b07ab3e4a148309bad45146d6 SHA-1: 27bed21883afc6f96fd4d57308ede619d2ec8da9 SHA-256: 56d0e314ea078fc178e318112ab0e8f3be2811039a67b07063d355145de38a21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of these links and the detection by security tools strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://chcial.ru/uplcv?utm_term=will+be+going+to+worksheet+with+answers PDF link annotation
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/b544ed2878a372c5ec1c8e2d789233d8/36347575383.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210607014408.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/95299566232.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/245518907.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///pixupaxusixavaxurogami.pdfIn PDF document text
    • http://eva.am/files/e2167950c170223f.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/cttov4mb878tl4u2vk6sao7aa0/40274839324.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/bubasezek.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/26426440982.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/binijizomezosivej.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/e1df4e5bbcd2f2e490b89dc7857b41ec/96989916557.pdfIn PDF document text
    • https://airbays.com/userfiles/file/63617968523.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/032305508394.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/96225646990.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/21979026162.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160786aae7a470---39544365243.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16113b21a975b5---dujavupusowox.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072ecef20b32---lukagepotinobuwiwuv.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/lagetijotud.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/piwob.pdfIn PDF document text
    • https://zzhqhi.com/d/files/6479272320.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b77d566416f---92874312999.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/6b0b06898f39fd239c18e1c7f589c105/71531006438.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/lulizapavi.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/38258018284.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/rifatudow.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/givixonovuxegod.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/86523784570.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_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 10696 bytes
SHA-256: fbe0735f5d728e579bf1733bdaab8da0e5b61dff281eeeb3e8c4adf921a06f0d
font_01_sfnt_off000124ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AE 16836 bytes
SHA-256: b954af77f06f51ac03f6aa0188a3470c8e6df59a7de7a47b59a46a722bd1a291
font_02_sfnt_off00015041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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