Malicious PDF — malware analysis report

Static analysis result for SHA-256 f594bb7300aacc70…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 15:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 19db7c6b798fa057ee0754b84ca014b4 SHA-1: f160981eb607e653405b83c1b60d3f8261e92c92 SHA-256: f594bb7300aacc70406cf6fd1a4c68d08f21733322f49eb4c3fd0e6a531f5b61
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the document functions as a link farm, directing users to various domains, some of which are hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a distribution or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://astoraccessories.com/uploads/ckfinder/files/13054974140.pdf In PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/vitesamukasiramuduvem.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/nexunez.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/29360870.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/vazamisavogarubatilu.pdfIn PDF document text
    • http://tion.hu/upload/file/zedosusabejujolira.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/bivoxejakinokawimobon.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/84266171062.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/vulariviwekesinibajama.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/jojewefasik.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353544449e7---xebetefabodepofili.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138f772e25cf---gesefuvukokosazuxub.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/vixumotapikolezowebofora.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/73290114814.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/84422519295.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/23600377219.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/40549441727.pdfIn PDF document text
    • https://geniodelweb.com/file/49972611071.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614163026fe62---makeluvugesizag.pdfIn PDF document text
    • http://mcutech.net/files/kosukuxu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/4pjoh83v2acmup2qrbfujuj35a/4772172204.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/zobiseviw.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8f9202565---diduvafofuxen.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135177bc0052---jiwutejojuwulutupadog.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/devabikekowafivodejova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=easy+rewards+apkPDF 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_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 10200 bytes
SHA-256: 0eb7e129a882890a386bab6f04050506471232a4b4000e25699c070bfdd70b73
font_02_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 16856 bytes
SHA-256: 3e83bef06329eee3a8d83c8f69125357df8d23e208449a6fb5b8ff2d658c117c