Malicious PDF — malware analysis report

Static analysis result for SHA-256 8189fa84204ce1c7…

MALICIOUS

PDF

107.9 KB Created: 2021-06-30 21:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d35bc4cbcf023e71fb93430f4881f94a SHA-1: b5a62d2c586709be3529304030d896660d6630b1 SHA-256: 8189fa84204ce1c7cd2668d18454c8dfa838831a69c9e11abaa4bb26fc59e952
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebf1dc6683---38806986718.pdf In PDF document text
    • http://email-database.info/userfiles/file/tozij.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/nuwexapimopozezubefixowi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8qj2rokoskpbq27h1gl5rs8vd4/88429688548.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/venitupokipin.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905e2dc881f---musiwozewuwezexenolosatez.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/wonogaxigafeliwi.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/eaaaefcecdffa075d4fe4ce0026ea350/96409319921.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081724cae6bd---45702735432.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4ffac79de70ac8189f72aeac1d77beaf/futugit.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608176d60e31f---64861544037.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/7cb76026456b16e9613c174e43362ae5/50108515486.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fe615a804---rugede.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/27065699610.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/22933ca2bc43272a3952acdc795b99f8/ramuwi.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/73625845460.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/5538303153.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/da767e3771f9346fb95171238dc4815f/xezuzupubutiguredamera.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1882446fe---86929779798.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81f84c95a7---4701447336.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072a6b48a225---ludigofenemadabofitura.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0700122356---38792267900.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/lodamewu.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/7411601005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+breakfast+for+intermittent+fastingPDF 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_off00013d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001554c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554C 10796 bytes
SHA-256: 698c62ab9f1d82a70ac52a8a4962b55f6da53dcbc959b63f17ad9fa3ae70c4b7
font_02_sfnt_off00016e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E41 19684 bytes
SHA-256: 02e9134e868cbeecb63e9fdca5bdef0e3a181fcbb7f19fc097cadb1235ad2646