Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8c3bbe38453cc8…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 00:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a186d602f6dbe471f747def20756162a SHA-1: 09189192b8753f6030c6a66727f11809bdc8225e SHA-256: 0e8c3bbe38453cc8545bf218a8b52965638aa880f9959c0e394295cca46bd4ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or initiating malicious actions. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, strongly suggests a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=harga+timbangan+duduk+manual+300kg PDF link annotation
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/juvur.pdfIn PDF document text
    • https://zhansq.cn/upload/file/walewinorolemuzunot.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d17ea66d0---fosikijaduvojeguroz.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faadc1ddeba---11289163049.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/fixasalurevedasuligu.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/afe564b1fa61c903660aa4db3b3235f3/mutekuzoxurevesolusutem.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nr0nbi9dvj5mqr0jtiu7pmtorc/58925166855.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/mofeni.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/978f6ec3c6e46c7c904e7e0c4c32b282/61966638460.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4e106adb6---59092722125.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/katokaguwa.pdfIn PDF document text
    • http://ahchala.com/img/file/76540312422.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/89106475463.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/wonumapomutamo.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/daraliv.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/mekuvax.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160859e08cd7ce---62139864069.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/33695997962.pdfIn PDF document text
    • http://nineslash.com/user_file/file/gepiwobepokuga.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16117c53da145b---56742331049.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbc820a433---lelunufal.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610c4d6f2e0f0---87553019735.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/26766252483.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/47369995160.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_off0000c8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C9 10788 bytes
SHA-256: d21ed779d2f6831cb0418a02ca1e13ffe7d136900be0e09ca5501c86a8073481
font_01_sfnt_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 18008 bytes
SHA-256: ea4571fd0f3bab24dee54aaf97c6abfeef23d87cfce78d5f2b024ffd5ef525ce
font_02_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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