Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ef4c357830d0c4…

MALICIOUS

PDF

83.8 KB Created: 2021-07-03 01:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a666115a5fd540c24bce9247f6433aaf SHA-1: c6ed5c77b2864531349e944b6d3d0e0f5fdeb956 SHA-256: 07ef4c357830d0c492bfe125d0f14f28f08e1e34f99afa9418c94a19ca17e21d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and potentially disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ab37e56c94400f425a7f3e0aa6d3f399/dezafipafemibaxuwinenu.pdf
    • https://noddy.nu/images/file/nebivukuroxamulepevaxa.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/61avs69r4s76ms0e2druandajd/menafofemepi.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/63452254056.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/n48ffk969qfi8lcih46ogc44k6/tuguzamoxaxabufapemasuzo.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a79cd0a58---56638074173.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098967427df8---5852981011.pdf
    • http://www.biotanika.pl/upload/file/bigemulazazipizibu.pdf
    • http://bixenony.com/userfiles/files/27490602806.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/t9vh3m79psn422i9ap3slpkedp/42558283186.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcc58da956---dolaje.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c676402474---xobewuxulolezuk.pdf
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/71015535860.pdf
    • https://aspirans.com/files/file/70621836856.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/89558099771.pdf
    • https://anthonygillant.com/userfiles/file/sexeji.pdf
    • http://absigorta.com/E/file/juvamogogulolebo.pdf
    • http://agiusfuneraldirectors.com/files/file/boduwolewegum.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/765df775768d074647dced71201871da/pejukezizefobulatigamiw.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074743dac469---manuzesalob.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/9857e09e60eb66b114b478a0233a44e9/kurakitarulazojafu.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee50875c8b---porisamilutexajuna.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a879d1152de---59440282566.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=perineal+urethrostomy+cat+recovery
    • 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_off0000e7f5.bin
0a2bc641335ac9ab8f7772f9fa249c0fe37038f599e4eb0ce49dce1ba52ca578
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 10776 bytes
font_01_sfnt_off000100a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 16792 bytes
font_02_sfnt_off000118b6.bin
3fdd422f066b3906a4154ede8b3106c1bad8f3de51b9dff90ed1b99eddee8164
pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 16072 bytes