Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cd442962172501…

MALICIOUS

PDF

77.3 KB Created: 2021-10-05 01:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c2840d50a046a1784c4badf4b52cd2d1 SHA-1: 39ea815af71071e834b0439ff83110a91ce6b9fe SHA-256: 31cd44296217250181b7b7539eadae3052b0ff13113317c98091d0e0f40ccd90
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, suggesting it's used to distribute further malicious content or lead users to phishing sites. The PDF structure and link farm behavior are consistent with phishing lures or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://vwtint.com/userData/board/file/vasiboludubelenosatiredu.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9541d73ba77359c99f4895049d325d53/korigesi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161484a8554ba0---91008841245.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/e9o5knki9e6f14lc1vtqt4fd47/45290557748.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b83b7ec5c3---godumapa.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/vofunofe.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/56895096531.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16152515958c0e---32057592091.pdfIn PDF document text
    • http://boxethai38.com/upload/file/97033352843.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b30280fcd---4593142986.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/26357841300.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/lodivixiroze.pdfIn PDF document text
    • http://artio.pl/files/files/lomexedab.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161575023eac4a---18755899746.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/5739780265.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161430ecb56b8c---64632545441.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210915145655521782wpcb7.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/12315373862.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a677a307ec---mikemojuwi.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/rozivovalefamuxatufip.pdfIn PDF document text
    • http://ipceurope.com/assets/file/79546934150.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210903192045137.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/xotirezisozujapixufuwekim.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/xekatamer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mn+prevailing+wage+highway+heavyPDF 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_off0000c840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC840 10404 bytes
SHA-256: 841e8d06c6823006213abb65ccf5a5577b9dbea639850650eb88248934914be0
font_01_sfnt_off0000dfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB8 18104 bytes
SHA-256: cf6e1b0ed54099fb6318fe72bd7b07eedea11637e7aece79da3e1128e49a2585
font_02_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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