Malicious PDF — malware analysis report

Static analysis result for SHA-256 def899e2d322a57f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 01:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b9a69a5d6f7cd05c5fb9bfd154786ae0 SHA-1: f2533999c94dc5f56f0100fd2a93dcb5d62d1b19 SHA-256: def899e2d322a57f1d915cf7a881d2077961ab24f6a7790d7e666b9cb7b8b636
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/4mh5vkn0dji2smi19sq6pfa29j/83106020178.pdf In PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ecdd54b9e799c7cb67af5bc430f45448/14168461741.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7fe216a9d---nawik.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4e3241846---sikefarumegobewe.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/mosavuxijasobinepu.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/xijijomidofotaboxijovuse.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160993a0f13a3e---kunusedipiniramenanen.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/63124836617.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724e2be9963---98713162399.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c960bd6551---72329000841.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/dabevusixitotevuzukusot.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160794ac79c50e---derotepoxapogesa.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070fe16e1734---22137635305.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/78859646379.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/73851741723.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077faa561aad---81156445207.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/wasejifop.pdfIn PDF document text
    • http://elitvorota.ru/f/file/zesareduwiduxud.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/44551785806.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/jasemokuruna.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/borawelimevoguwisade.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e3fda4e6---bonivegibem.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vugurudikedugokimubipi.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2eaaee1d0729ab37db91f17b47493404/64548980691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=kyle+richards+and+portiaPDF link annotation
    • https://mediaget.com/userfiles/files/52007875333.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_off0000d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 10716 bytes
SHA-256: 833b91d27444e4a24aff21f208cb774086af19022626c53e6a96cf294d762e42
font_02_sfnt_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 18344 bytes
SHA-256: d345473e601aa682ec8e89ea74050c06ff05c31a0e06c8792945ddb19177dcfc