Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ee734b7d900380…

MALICIOUS

PDF

102.1 KB Created: 2021-06-28 19:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 6cfb8af7a3b36253cf296efe54a1aebb SHA-1: 6c3a036bfde2e0c934b14a289abe8fecde760f27 SHA-256: c9ee734b7d900380430b56f03f145ad568557ac9d87d45f52fb3a4ac945ae22a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external URIs and link farm heuristics, indicating a strong intent to redirect users. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lure users to compromised websites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=trip+to+gambia PDF link annotation
    • http://porpora.info/imagenes/imagenes_contenidos///tegowel.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb27df243a---23915063276.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a5439d9d2---kogugemolewunewa.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608697cd6355e---fufalufetivozu.pdfIn PDF document text
    • http://paliukenas.lt/i/File/wegajefagiwebudon.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062319222373499.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/7ddcca2ffa728d382f30a04b03fab3bc/80511221942.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/98570312741.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/0576dc4d19dc8ddc747ed712431cc27a/54046957993.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2a7ea1e096c8a5250dc3df43bb3792d4/naragonizus.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/480275871609c537da9ba4.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160899a14824d0---xowunobogigezi.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d157a8c436fc3deac636f99b83f18b69/zepodor.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0cea67a8e---70485194150.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/novafazivobisu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609363e152bb6---safojutemobefaliwus.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/dopazemib.pdfIn PDF document text
    • 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_off00012e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14628 17404 bytes
SHA-256: 4192c3361f91421a3a654f35ffc6ed76ef5886bb934a7a634268387fc81bb9b3
font_02_sfnt_off000173c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173C7 10248 bytes
SHA-256: a1e6ac7a2b770a7fbd4ade228479cad218c37b83c7f4a8b6031552586967e070