Malicious PDF — malware analysis report

Static analysis result for SHA-256 253248658b344fd5…

MALICIOUS

PDF

84.8 KB Created: 2021-07-20 20:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a169664005d3aba2137b25df9c5886c4 SHA-1: ff8d7dc2d659183536d8fa5e5c6155210b68f86f SHA-256: 253248658b344fd57f6795d8dc99098c64ffaff5b57a00d4766cc4ccc754a313
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The embedded URLs and the PDF structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3b73bcb21bf327cf7a729928dbff7db8/41279971207.pdf In PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e922cec04f7f410f3e2e14b7efd88e98/9566761908.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/2af3lu8b1lkmsk74002to7f1nh/8498070674.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/70140747941.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c35075d7983---77955986315.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/xaneforavigov.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/49bc5ddf182b669b2c2435bba8f83313/vudewuma.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a8d5d5b5e410451bc60cea40f60c86fc/66672131088.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160773ccf6fe32---1787728984.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/lixepoxujibom.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/89908722700.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/55388143398.pdfIn PDF document text
    • http://chongros.com/userData/board/file/luwufejiludokokibe.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/82854487413.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/11559962429.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/3283380481.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/042e3e4e73a14290b02dd57866606787/71557295338.pdfIn PDF document text
    • http://webursitet.org/Files/file/11950717499.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160764fa4c976d---94735953187.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/14540918139.pdfIn PDF document text
    • http://canvangdientu.com/images/file/liwagoxezesosozuma.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/lejizejuxegedoxara.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/39469365237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+invite+friends+to+minecraft+ps4PDF 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_off0000e6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 10956 bytes
SHA-256: f2ddc2e9dbef5e3f05281a77e7fcd1c2a0a9bfb23bda0bd043b52aa4b0bdcb82
font_02_sfnt_off00011877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11877 17340 bytes
SHA-256: 13b56118063408994e554b68e944f3feaecef8afb6b63f9d1dc7c1e7c90f3295