Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b6ac52dd535dfd…

MALICIOUS

PDF

166.8 KB Created: 2021-09-02 22:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f54cd3d3e1807a8542da0711d4baa843 SHA-1: fafc3eb5c3070231b2918ce8a1c8d4c3ace7244e SHA-256: 27b6ac52dd535dfd439c25227308ca3ea5a43fca4d0f1affef8693943004af4f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites and disposable hosting. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM indicate a pattern of distributing malicious content via link farms. The embedded JavaScript likely facilitates the download or execution of a secondary payload, as suggested by the ML_NYX_PDF_MALICIOUS and ClamAV detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://webdulich.com/js/ckfinder/userfiles/files/mutakigisevizobu.pdf In PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gofeloxiniruxoloratapipop.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/24523098828.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609997b423148---videwaxuxivobav.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/digosusimagazabomoz.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/53098459062.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c55425150c6---58220412102.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/aa9eafdf48ca92fe5a22f5004255d132/refamujuji.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/69279826695.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/11516287347.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/56038594514.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/f5r1q4rmbvnck19kj5u4lr1v37/97241399529.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/d5ed18ff78fdbad87d71b4c223b96705/29376294159.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/59271568757.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0069bb17---vekuvutotefujizotonujoro.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/pamupamagod.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160909a4995855---vemijazolaromevibulodax.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/79024170515.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/71659841744.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/91464221053.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/34269328396.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/e3b5f075c6a0a86db017976f81d6efee/lulelabiwixixalozakozib.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/28022c131b9fb9b23f578cbf93c3ed6e/livure.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/sekakewixobebewafemu.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/59218739688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=leonardo+da+vinci+walter+isaacson+pdf+freePDF 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_off0002232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2232C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B43 10724 bytes
SHA-256: 083c01142782d927d922c47986445324a7bf65cc4c719a23d9811727ad7d6c1b
font_02_sfnt_off00025406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25406 21836 bytes
SHA-256: 0a72ccf635914aeb83567cb67add107386b40eb30973b75dec98a54249b956bf

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