Malicious PDF — malware analysis report

Static analysis result for SHA-256 4837d50432ea5719…

MALICIOUS

PDF

136.1 KB Created: 2021-07-06 06:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 75251a46c37330f03ae2d97c09adb079 SHA-1: 58d518eba31083e86f0e091ade9f6fa251bf797c SHA-256: 4837d50432ea5719f60eec27cad1b63b1dad9b96c7938057f7de750f45e9510e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9315

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://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090505e321f2---nawisawivala.pdf In PDF document text
    • https://annjulieskarpmo.com/userfiles/file/tapamutotuxigunilumu.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/f9bdeb62b4abf2e6289f4d709f8fb4db/jeveti.pdfIn PDF document text
    • http://dnepropress.net/files/file/sinugigetefinijis.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/638d35a9c4126b7502ae595dd61a9e38/doxubup.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/40cac58054685dcdca8eca772ebd9b28/1316305740.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/47634255902.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/9934180638.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/guzula.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c9547eff78ab3ba991b73b0a0c422fc5/sonox.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160825aa74a614---70735089684.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/d35a812b930f418a03487c742336cbce/vanobozaderupigine.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/rifumarogux.pdfIn PDF document text
    • http://vejwun.cz/images/nuzukipewolizakuzumofe.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e0db6d56b50cfe814c660dce1564d7c4/sezizeguwiwefetoges.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873868e7369---10213822364.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/64949407138.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/junekafunuwomom.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/fotuvifinexipopen.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083616b71e0e---mulunivumajevu.pdfIn PDF document text
    • https://successalpha.team/upload/files/69528819729.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/d671t4m2u3m8hdr86h9qoadte7/90114600317.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/kasomenisomapoken.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1ea5f7bfa1913042e8b4a45f96010941/48128052068.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/10467369844.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608852b64f4e6---57002167340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=meaning+of+elam+in+the+biblePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C08 10524 bytes
SHA-256: bb87402526a87e64d78cb996737c3c44b4509db3182639671f6cc376a7a6d0fa
font_01_sfnt_off0001a3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3BB 16684 bytes
SHA-256: 94c64957669ab547eabc847a120d8520c519c271079ef9f49d7490c52accd480
font_02_sfnt_off0001bb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D375 25676 bytes
SHA-256: 84882595e114a233360e9f895ba6991c6ff2b6ed01cdd5e57c746c3b50658854

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