Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff2f58c81e1471c…

MALICIOUS

PDF

87.9 KB Created: 2021-07-02 09:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 8856689e2b071e4bc75ebbecea89c643 SHA-1: 363824e262fa7f2443bd76719e67d45ab51427e5 SHA-256: 0ff2f58c81e1471c60ee666cf50d82df8e4d0e3f8788ce7bd7a3b844c2af5967
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=booter+xbox+one PDF link annotation
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5ffc1539---losimunumusatanigovoziput.pdfIn PDF document text
    • http://greenld.com/userfiles/sovidoxafivijigikezo.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/990b1a4753c45aedfdc1fa0cc672eb54/pepakofuxeguvej.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/buwixaviviruwoki.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/vezutob.pdfIn PDF document text
    • https://aaaxxion.info/images/file/72798711501.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a052e97ad80---19026698230.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/4e01b47f04e0140011f7ede6bf6ed71d/dulil.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/29591821683.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/16084108576.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/dbd4c6fdf1515c270b04e339d5057583/8130252736.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/55839690105.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2f6b66bcb---zigezota.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/fdb322b64830f2e94bcc13b7cd2c4c2b/buzubudamirinufokirotewig.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/fikakipuripegixowev.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ed860829---67196737701.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/vimebifurumisomemofapuz.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9652173d2---31564991133.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/o74so93je76olhrjvpckp7s3f6/60680237151.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082b0afcf76e---jasowafobow.pdfIn PDF document text
    • http://renovator.cz/files/file/4378110848.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/mazalatotezupopuli.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/80820718723.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/5620248256.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 16088 bytes
SHA-256: 0e3d63f173342003c62a86c726d4d5a85e7f52d44cf06618766a4fa08a0866bf
font_02_sfnt_off00011116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11116 16820 bytes
SHA-256: ae1fb291da823957a97d1f8a203dce1f8305e75d3689a40b8e64c7ff77abafdd
font_03_sfnt_off00013cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC6 9928 bytes
SHA-256: f70575f8c686cce3455a4e19e949e83db63cf938958e71feb38b038d37d71d35

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