Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbd3555ac13f34f…

MALICIOUS

PDF

109.2 KB Created: 2021-08-09 11:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f402899ef4e5b77defffa5b766711855 SHA-1: d1fea123ef6633449a9ce9f32139b25b92910a12 SHA-256: 5fbd3555ac13f34f00665d114fb40dc5639c0cb062d98032d2b973986b2034fb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/22e7ac88072d8c5ede67667f3150d776/babudurevaxepebitepeveti.pdf In PDF document text
    • http://vizugy.hu/uploads/files/files/sobida.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/30933079630.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/vuwisavonebutabatonod.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c4232e7b2ee83ab96dd5925fe5a2a9d0/60081022383.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/42e607a6a5f8da01e8d3615205d6724b/lejujuvofeluvesexa.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ri9b1rngspmr1manc6v98vnp10/buladinawaporonomakivum.pdfIn PDF document text
    • http://seamacros.com/upload/file/xajawejamurawegipike.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc20f684026---98983372830.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/3775962381.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe1a205a8---59698859027.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/38067669731.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/21343597457.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/firodadixovuzalobaka.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/fuvonevadi.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/kuteremoje.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e367922c84---poputomir.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/wasipipamebofufinokotus.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/vapuvelom.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a063ba66a2b---86805146700.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/71388430982.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/09306fa5945178df3c115e7118a1ac95/raxuvivepija.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160826ec0bbcaa---xejejebetirurajaputibak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+you+count+7%2F4PDF link annotation
    • 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_off00014806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14806 18236 bytes
SHA-256: c16d6a0b6592e7bcf6b41e4fd382e7575459b285303ed234cfdf3f77f1662ffc
font_01_sfnt_off00017804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001901b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1901B 10116 bytes
SHA-256: 388a9cfb05fa2be8c2501f90226322d8943d6bdef77371b3c9fdf818ceed1b04

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