Malicious PDF — malware analysis report

Static analysis result for SHA-256 addccf08084d0996…

MALICIOUS

PDF

74.3 KB Created: 2021-09-24 19:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d113918f5d961440ca758b516d47a518 SHA-1: cb389b633e1f2cf4b70342dc165aa1c0ac72c6de SHA-256: addccf08084d0996d5143f515e169e1726e3af277a5ee3cc10b05ed434fabc55
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. This suggests a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sunnyvale.com/wysiwygfiles/file/18856920817.pdf In PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/wumavetafawob.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/riveranobap.pdfIn PDF document text
    • http://platcometals.com/images/file/12016555789.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/jobofilozukizofoziwefin.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/53246975173.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/muvuxeleb.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/54314533210.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/29098215654.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/65221727555.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/50362554460.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/94976001312.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/kurutaluledu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7ee143d4b---mosalogazuvoki.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/sakamijew.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456cf491056---rexutuzedirajejini.pdfIn PDF document text
    • http://sql110.com/pic/norazovaxavuxin.pdfIn PDF document text
    • http://minerva-collection.net/files/files/61713052895.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145efbf20f5d---33439181754.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/49171120663.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/walak.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/10557055357.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/pelafepibidaxikop.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/gamefapaxatemozivenop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+share+files+through+wifi+between+laptop+and+mobilePDF 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_off0000b3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 20800 bytes
SHA-256: 68aa68ce4e18feac93d0fa67b3395205c8a423c4956e30097629761b29f6a680
font_02_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 11260 bytes
SHA-256: 736946ce10270732362f0adf967c084558e9952ba7410c5f37c8c29d63fa3415

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