Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfebe2ed858e49e4…

MALICIOUS

PDF

87.8 KB Created: 2021-08-01 05:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1f04b98fa08519b5ed37f2b9a31d06b SHA-1: 068a634f27e813491863e4688400db38055a4748 SHA-256: cfebe2ed858e49e4ca4dafb4d059d0d87c5bb1d84be041ad6413faf07b711fe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, many of which appear to be disposable or compromised. This pattern is commonly used for phishing or to distribute further stages of malware. No scripts were extracted, but the structure suggests a redirection mechanism to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://girl0229960192.com/upload/users/files/43038291670.pdf In PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/4085040831.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/rasulazi.pdfIn PDF document text
    • http://bjjiffy.com/upload/50984632590.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/48642477088.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/pabakibuze.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074517e0c142---tuzagef.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3cfe40da275609234b0808a331abf17e/sedoroxadawurimijewe.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/blpp7c58mh8efamha8gjb98eq4/fagovipulirob.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b27dba11---24166052542.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/74665a24c1a32a2c9e24ec67e6759864/60071099599.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0a342764c---89207534791.pdfIn PDF document text
    • http://asvpp.fr/pdf/92595467826.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7c379cca0e4344269f1d1c49d06ce613/lolokomagijixiborumebova.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/43020921669.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/27750917126.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/43314827137.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/fdok5ndohje3rq6levvth2q058/nazufixesanugakog.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160757c5caac32---xaserekofawibopanuriv.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/b8pr6odhn2orjgaj1f2tbrkfm2/35552819827.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0fab761b---popidigijozowudibalubi.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/26000395219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dibujos+para+colorear+de+principes+y+princesas+disney+gratisPDF 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_off0000f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 11176 bytes
SHA-256: 3ba68b62c23cafca2a116cb736f35d558313243054b449a2e3b8305a2c0e550b
font_01_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 17824 bytes
SHA-256: 594d1571e6d58fd53df42fd21088301c599987b2fd96356c197812791af8c647

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