Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42d552e630dd7f2…

MALICIOUS

PDF

94.3 KB Created: 2021-07-04 01:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f4d47621961b40f537d455af8eea57b5 SHA-1: fbce4d5c362828fe5448e28db3f04ca03ec72f75 SHA-256: e42d552e630dd7f27c10bda1fb56a66e87c388e01103600164e9ffd63db00f84
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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.
  • 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://churchofgodinjamaica.org/app/webroot/files/79145739570.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b700a55ceaaa4d7d23360b7c6d4bf47/futumuwovelojomatidawixe.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ltfocpcgogrp8udv5qn2hvg0q0/13193490918.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/0jhlql3om6ta9urqfk1db0upeq/jukixivonudizujobefafoke.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795c2cdf3f4---25854844618.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/ridikiforazurijanurozata.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/nawipuf.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/zavipubolorem.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/3219197516.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/76269082194.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/jemaxuxuxa.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/8442793516.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/gibaxodaleluv.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc5361b918---77993552839.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/69974260935.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/87797702844.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbeec057b0---bamojesi.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/5436568353.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/10563347518.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b00b7aa2ac9212fd7b211a280c3a86cc/99488294439.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5cbfde3687935ae845acbd39a0a9e8b0/xiwixewozapidawuf.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae98758ab2---7130933824.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/foluwoxonemuzo.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/19904072750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+burn+off+security+tagsPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/2843727039.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_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 10896 bytes
SHA-256: 5b96d062b2f8bb41515267c002ecc5572ecacbdc82aedc74d674db3806c3a650
font_01_sfnt_off00010e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8C 16892 bytes
SHA-256: 236c922bb3f4c96e099be1157eafbcd0cd03a41d396b3b8a6b5c52b280ad0e3c
font_02_sfnt_off0001259a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 17488 bytes
SHA-256: a2c9a09ba1403bf504c85434acc7314ad5bb1888de8f725fb905c7a47531e428
font_03_sfnt_off0001537f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1