Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e65d69bc8c6e5a5…

MALICIOUS

PDF

90.2 KB Created: 2021-09-02 05:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5548ffcc4a68f6b96516e3df4736a775 SHA-1: f6d60efad19b1c649f3d72ea8438acbb771380de SHA-256: 4e65d69bc8c6e5a55d1c538947ea477c8334df76cc6372ee517ef858b57790a8
156 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, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=thin+layer+chromatography+of+carbohydrates PDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a79dc562e83---texutoxazabijit.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/0f06b41b7f53f4dbb0fd88ee4e190416/45629277765.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/33350519410.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021521129354070.pdfIn PDF document text
    • https://bloomeng.com/uploads/44391965368.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/f4a81ffc37c06a697711bdbb1bcb6a97/dutaviza.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/17667548486.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/41623719230.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/sunivefadudunipuxe.pdfIn PDF document text
    • http://brukbet.com/user_images/file/xapakujajolagelad.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/fugexokete.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/2ffbab944bc322a9b833533e9555fa14/78490878716.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a403b65dfd4---97529792834.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160796e74f3b80---mijunupukiwi.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/repujefinosoxopas.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/fanepemuruduxabeg.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qfgeo557ujukn18p8l72pqpav3/wagonasadal.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/wujevitetakan.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/k5m3q5u544rq1g4ianaqb6b4e7/bobozoro.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/kojur.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/75159376228.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/4359369721.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/6385186450.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/polapetokuwolowimijokuso.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/kmppuja8f14uvukd9k3o47sta8/20258660556.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_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 18896 bytes
SHA-256: 6ad9630d511037a911d76251ffe295eb4ba339291a7ecb1751a7cbf71c57cd9b
font_01_sfnt_off0001293f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293F 11284 bytes
SHA-256: aef55cf1a3a87b25bade2ec24a7e354c96ce886f93547a1693cdd1d5dccccbbc
font_02_sfnt_off00014323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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