Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10311495e116828…

MALICIOUS

PDF

98.7 KB Created: 2021-06-30 21:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f4fe337337785235c1ecddf6775defb SHA-1: 6db3bb13823c7a36075920176a439becd0b01716 SHA-256: a10311495e116828d7f71f7dcda3580f0c5d001ba2caf6c3746f8865f2e1145c
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or facilitate phishing. The presence of a PHP webshell heuristic indicates a potential secondary payload or C2 communication channel. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PHP webshell / backdoor source critical WEBSHELL_PHP
    The file contains PHP server-side code with the signature of a webshell/backdoor (named PHP webshell banner (madspot)). A webshell takes attacker input from an HTTP request and runs commands/code on the server. Flagged as a malicious hacktool artifact even when carried inside a document or archive — the code does not execute from the carrier, but the file is a webshell.
  • 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://allytemp.ru/uplcv?utm_term=streaming+film+kissing+booth+2+full+movie+sub+indo PDF link annotation
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/1172139ab6245f509fdde73e45be1e48/18074455762.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160913e5a7dc91---63660358055.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/penumijazowedozom.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/47423112891.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa70a520a7---bupatopadok.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608928ec694ee---piraj.pdfIn PDF document text
    • https://hoalavender.net/upload/files/70736098896.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/90946951885.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/nebizeganejutuke.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/77095693999.pdfIn PDF document text
    • http://arablift.net/userfiles/file/nezelikebune.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/91a036fb7edb3f796a8220eb69f1d2b8/wetabesubeg.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/xalajajawobogovemig.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ec7763817b13431b05a0f82eb31f8a6c/zosunelebalelajutuniwiw.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f92d3d2ffe---taxofemewerivem.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/k677v288dmummk8gb4fqshs2a0/pukugovekodifireju.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7fed08a4b---maxajenofuligisixupini.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/k6ln6hp6n9ggfdf95aou5gmjd7/56000909910.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/gewubosemerekizovatoj.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2ded01637---ramulaxofebetalam.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/lonijufodekimakejuj.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///dulirixikuz.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/12871532979.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA4 11396 bytes
SHA-256: af105e3eeda8e91ee11f7409a1e20bc40a85ba8d923c1e38763a58b11caaa1d3
font_01_sfnt_off00013729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13729 17544 bytes
SHA-256: a4db7e4b32c4ee72f1164f74f7edafb1ab790e13de7e569ffc2c73202daa6b18
font_02_sfnt_off00016510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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