Malicious PDF — malware analysis report

Static analysis result for SHA-256 459ec97ee92d0164…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 01:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: abb68097383c8c5f34f1d23d7fae41ec SHA-1: d552e255387521bf659e01cb229b5ab5c97439ad SHA-256: 459ec97ee92d01648fb01ba0d3e1acab48c1a9f1b386447953c73c13455a64ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to compromised CMS upload storage and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbec330ec80---27937204645.pdf In PDF document text
    • http://studiomalpocher.it/userfiles/files/26458728646.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16091a07d3d9d7---tuguzirozega.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081e3b480966---govigebe.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d04a501fd---86920450786.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/57835303086.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021080318170780554.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/29700411547.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9b38c332f197a858c9362579ae5b08f4/91115963652.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/wilidipemodawel.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/48581996677.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107020205544921.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210615005707.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/85926421980.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/68191693200.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/fc57a1e80529f13a6a70ed34a702e38a/lisopetepanutovalijuj.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/woxexot.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd1524fba---buviponedasosulowa.pdfIn PDF document text
    • https://ka-base.no/images_content/file/41989709845.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ce72e0ae9---tilivog.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/15676892162.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4c9eb434bece6d047bedb4f900d15ab7/1696994547.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/19379614568.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769f625add8---xazirulasopenome.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/bozudagofopadajuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=idle+arena+tier+listPDF 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_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 10072 bytes
SHA-256: 5666086da2a24ce3735232c2e1b08843d443febc467c61c4aa2dbcef2b90f8f2
font_02_sfnt_off000115bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BC 17196 bytes
SHA-256: d1d6e14b3a37264130116f09a286f54c71d4d91207f9da6ddca9201fa91b5d77

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