Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50bd7e68907ea14…

MALICIOUS

PDF

71.6 KB Created: 2021-10-09 05:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 542017f8a68910d9bab04f5b3e5ee7bb SHA-1: 12dc07331e1d3a48e61d2de2ee0824d8050972d4 SHA-256: f50bd7e68907ea14f6e19a0b9b054d08f3a23b5f8c4c18f58c558a7bef8f803f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Some of these links point to compromised WordPress upload storage, suggesting a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.itidharamshala.in/images/uploads/files/jamatiluribukozeni.pdf In PDF document text
    • http://spamsmsgiare.com/media/ftp/file/lodidaba.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/jepobojuvalogaxesopa.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/mefenibojarafabewe.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/83464799586.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/kowifimuvijazewukes.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66124182163.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/vuloguputoler.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150276ba0ceb---73192883178.pdfIn PDF document text
    • https://wmu24.ru/media/file/zoxoxafometuluwatemufu.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/kugibep.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132254293073---sokemimit.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/kenunu.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/sofosujaro.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/1f019f1491465219939f2e699b633b37/3869990160.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/72574379092.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/kumomumipetafurukite.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/99328290214.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/90482881779.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/71153363258.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/30023339397.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/jubusigaxilenijuxubija.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/11923953171.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/12461733299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+meat+can+rats+eatPDF 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_off0000bbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CD 15052 bytes
SHA-256: d7d6bff770f9126ecb8962c235cb53570e4f40c14de309a2695092549590b0b2
font_02_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 10232 bytes
SHA-256: 6127cb7283cbe969eeff72bdd16967dc7fb2088e9505fdce01b3c3b4c87948b2