Malicious PDF — malware analysis report

Static analysis result for SHA-256 f138a1b1a614ebe5…

MALICIOUS

PDF

82.3 KB Created: 2021-08-03 10:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b6b178cd29f6c7f4c32ebe00f20e4b52 SHA-1: f8931db98a89b4b4ed4b5edfc49b9d3ff4e98bee SHA-256: f138a1b1a614ebe50bd25b0bbc380944a88da909e98b5b7179594daa316d7071
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings suggest the PDF is intended to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=cemu+emulator+android+apk+download PDF link annotation
    • http://birnagarcollege.in/userfiles/file/xebusaferotel.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d9cf6f626---tuzowadisupukitozeno.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/092d638129da38ea1aa908cd765a5d8d/kironamugizopirogola.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/xuduxirarekep.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/gomisezogop.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/42149479655.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/27291072772.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608564ec3f5df---dosalulajusavizi.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/26822704164.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/cqgkrdc2no03q3cvkg7ualmk41/sojubasozirakevu.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7a04faa57003a9962958e32587cf8626/dulunonetogikebaruweka.pdfIn PDF document text
    • https://yuss.it/file/notofugufunuwonovebur.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/1b30e6a338006e7a644bab171da8bd30/87635570121.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/58a444cf3a389bd16fdeae415e5a8bca/gapunepitanomubebimef.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/d40711a3bb8f2e7a4edcb2294bb4cea7/mulenar.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d40df190495---tegebexedikum.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/tegur.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/bikuta.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ee22e838072719e5ebed6a16da96423e/sawuforawolunekukopig.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210602020613.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/baguxomarisufudabivaz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0f5339ac7---vixoguvisubamirubiji.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430170607894275.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090760a9edc8---vadimowuruz.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161039b0c66136---motel.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/liwimokaviv.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_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 10692 bytes
SHA-256: 228c048b3d9abf6c0e59853042749e68d6f271e589ab209c9eae4bc0e581e976
font_01_sfnt_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 17524 bytes
SHA-256: 6daed1916075dbc74ca43e9e896a74b910678fcf3b3fcce107ad33be9c02a3f1