Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fad27be21ab957f…

MALICIOUS

PDF

78.9 KB Created: 2021-06-29 12:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20c24d5ebe763e089f54f37362bccc7e SHA-1: 582f7dc5a778507485516a1e74a2f6c9269efc2d SHA-256: 4fad27be21ab957f2a3b7a45a8640e436ee9fa08fd51eae40e14fad5b116e4b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to WordPress sites utilizing formcraft or super-forms plugins, suggesting a link farm hosted on potentially compromised infrastructure. The presence of these links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2a2e5d4d4---69862048693.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/koliwenes.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/450eaac61b17d164f1d2d815e41e4769/tomevedonexep.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a945ed13ab8---zugupofuwolivolibufew.pdf
    • https://pezenasenchantee.fr/userfiles/file/41401852815.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/buleludisoxasisezazo.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa370bed507---29969660938.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf133a77ad0---wafumoj.pdf
    • http://backupcenters.com/userfiles/file/xupobed.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/apikfdu1upccmh1u4arrq5lsl7/47232585700.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf8d42902c---dezavisimarudinopanusema.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/5b28fe3affdc427550fe482012f3adf2/pegofokosixel.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/26ebc1c2bc57e941b66c1d3f36ec0ae8/nekewe.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/0419c762dba2192db7a59ec506e0698d/40484299525.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/a2jnj3qg6l1h1gpm8a0f0qg7bt/19639012636.pdf
    • http://kjphotocon.org/data/userfiles/files/sunanobasedomurored.pdf
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/potegifigugixazixexanidag.pdf
    • https://mzlpro.com/web/img/podborky/files/fatizewidaguwifirililov.pdf
    • http://zhengfutz.com/v15/Upload/file/2021513214409328.pdf
    • https://vestol.bg/files/file/57684902920.pdf
    • http://rafaelokazakov.com/file/12305286012.pdf
    • https://burstallconrad.com/editor_files/file/71898035684.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=coc+village+layout+th6
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d128.bin
ce12682f01cf396181fdbe90df32985deaf13119373c113e9cf05271a0ff37d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 17592 bytes
font_01_sfnt_off0000fe35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 16792 bytes
font_02_sfnt_off0001164c.bin
3782c1df344bf624091e3cf322c58d007cd74164d19bacc8ba8857b1cf2a118d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 10616 bytes