Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf0f45998d9f5f8…

MALICIOUS

PDF

96.9 KB Created: 2021-07-19 08:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5be60f3e065ba751c918fd04045155f SHA-1: 8918a3d4532d5933c7f13fbd90a11b48fc7c6a99 SHA-256: cdf0f45998d9f5f89274fd306c158063bd78d9c49fd83f6a0aaf0126a8c744c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, designed to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as phishing and a trojan. While no scripts were directly extracted, the structure suggests a link farm designed for phishing, likely leveraging embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31581d0378---kutototoguxu.pdf
    • https://bistakalikotenetwork.com/userfiles/file/zonudebuxinadinodatotafij.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4fe2384e3---sirajusetetojatejadofowes.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160888ad86555b---kinuvitizobuzaboxogaxol.pdf
    • http://gld-lining.com/user_img/files/58847974976.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f049ba98b83---nulorivifix.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7a2759562073e886fd7f59df79943f2a/37527510541.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/lapixolaguturorewidovim.pdf
    • https://advantagelic.com/singhania/downloads/file/30132852689.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fc1c3e3f4---dajiwuwapenopuke.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8810624410625d6721a792a5a7eeae65/5168249441.pdf
    • http://cortabellanews.com/userimages/3347135097.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608021294ea6d---sebenu.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fjml3go71rud8jri3seluedj45/42442986920.pdf
    • http://fszhenjia.com/upfolder/e/files/20210528035059.pdf
    • http://panziofabian.hu/fck_kepek/97763474038.pdf
    • https://marigabung.com/contents//files/xiruzegaxe.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6490aa44e---papirozuw.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c03918704---makekufakav.pdf
    • http://zhengfutz.com/v15/Upload/file/20216232321562621.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/720cfff58c9374182bac321a483049f8/70529289007.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=drum+roll+please+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb48.bin
9b696ede6948d0963c4289b65660f5e41f113489747eacca186e33c69f7bffcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 10596 bytes
font_01_sfnt_off0001036b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 16792 bytes
font_02_sfnt_off00011b78.bin
764799c8ef060889ac3c6ce75045142f0765a1d75fa37b3c532e95971ddb6147
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 2460 bytes
font_03_sfnt_off00012637.bin
bb247ae2fb514ccd079a5fa5be0ff2da30c9ad4bfd961751b961b789db17d88a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12637 21664 bytes
font_04_sfnt_off00015e48.bin
65ade9af46f8694db58d677bcd4f35ee5c0050db713fb2cb577c17d1fad5e7b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E48 16748 bytes