Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc8d596941abcf6…

MALICIOUS

PDF

71.8 KB Created: 2021-09-07 09:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79ccce8d54fda8d5aaf8cf7e476615c7 SHA-1: 4b6a0d83db25c999585d2b54bad40005224f7558 SHA-256: dbc8d596941abcf6497dac3b41f5cea113056031b156f01dd2275f264e1b9344
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 ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e76de747a---jerigawezafesidadapo.pdf In PDF document text
    • http://king-ber.com/UploadFiles/file/20210622165907605.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/7cf42d5d1e32e782e25d527507843844/xanaluduwidapuripabap.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/xenojapapajogujolokoresin.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/lanudewixaxoseko.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/81406454855.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/02caf069ddc4783f8345bdabc1f85c7b/zofemewevodewobaturajeked.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/58584845729.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/84045401531.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/8a21cf6f941ced9f802e7a78f545f217/66784278130.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5e7876a1---jelarijiredo.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/65677389663.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b14ed25d1---73618395681.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b294a8a5601a245c97118b392d126b7b/lesabakukeku.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/xijipomadekes.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161249a6666a73---31610863941.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/12116313639.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/31128447087.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/4912511694.pdfIn PDF document text
    • http://4bx.pl/public/file/54686701223.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/r5rmv1jhsdrjavbu82vobrfu40/61387886115.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22827b26d4---wabefafijawodakavaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=agile+scrum+methodologies+pdfPDF 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_off0000b661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB661 10884 bytes
SHA-256: 639601508ba5073b08b83694cac26fbbe3e2565cdb269d8f9670dbd2a9694cd6
font_01_sfnt_off0000cf5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE770 16648 bytes
SHA-256: 1bd079d055d5dbe3894e7242361884715ff60c2b9ca0e023fda69a8be4a47151

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