Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c9edcac05aa3ff…

MALICIOUS

PDF

87.9 KB Created: 2021-06-30 01:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1c04fc49e8f91d34495bb0c0500bd5a4 SHA-1: 7ffee1f82b6278e0069986662efe3527a0610c9d SHA-256: a5c9edcac05aa3ffb5cc6977e3646dfdd7748419328444ae0eb6b02be96ea314
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the link farm structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/a526c9811815328feaf3f1e85fb2d217/gizevixa.pdf In PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/bezowuwilezuzogikelem.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d27e6f137c168a2030094c178bd5bd56/piwipajudewini.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16096503990fc6---39886058275.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eb5ae9949---xuwiligemomizugivuxamipa.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/enpdlgnhm6tjmn4bolk27bmuhl/31346955763.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55877043802.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/4f5066f38ec37a3c2c82dc00cecc7361/87612332477.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/81716517943.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/24284799423.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/15355763254.pdfIn PDF document text
    • http://bucketdiaries.com/uploads/files/zasakawojifagirikoxegir.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb32808b67---wisazozekogexum.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/mukurawesapepegobi.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/64226875494.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/14886437194.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/nitirokonunafelojetaxaru.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727f3c22af1---28823784837.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/34502927477.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/9oqnur70eusfcv3o2v8h8oort6/33921621696.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fea31f70832416ef8b8e9cdd1b66bc71/88465502984.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-17/20210617124637292119.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9dbc0baa9d1ce8b8d407a8b58ba2c306/jiditadamigi.pdfIn PDF document text
    • http://sparkpro.lv/content/file/tijuwudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=all+of+us+plural+or+singularPDF 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_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 10384 bytes
SHA-256: c5cf08ae4c71b04eae6b536999a06fceb841adce04cb907bd4b3d4500a80a651
font_02_sfnt_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 17860 bytes
SHA-256: c151a35a829a59d32db390ec3ffd904a25177f29bfb0acdc23bda7045cceee1f