Malicious PDF — malware analysis report

Static analysis result for SHA-256 964d18c485d343d8…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 09:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11163a95915e5b3f30c1f79eca1d61a9 SHA-1: f637e468c166841cc97013621933bb2bc5b0bc2d SHA-256: 964d18c485d343d8a9ffe178fe4d760ad6c16b398cecaac9944d1c6a2f44febc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the presence of multiple suspicious URLs points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://banquat.com/userfiles/files/wizuselekaved.pdf In PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/tenijinedokezi.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/63782657021.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/68741636950.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/27132020486.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139da4d0aa4b---25268417060.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/53401273173.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07a429a68---jajabojunom.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/99942888229.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/bovutefukufoli.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161362f1623e13---78585694127.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210904_224522_8339.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/wepof.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/zapasesejuvosizejusamabum.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/zelizije.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/vikepowetinuzimalinad.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/51834867231.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/rarupusawumixaniwugu.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/medajazetezulenep.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/zufolajafeza.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b25c99a8e---34052961218.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/zonafumupuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=my+talking+tom+camp+downloadPDF 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_off0000ca2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2E 20088 bytes
SHA-256: 46dd1d9eaea50bf9857d55a4ca80e98f6961035f3c4e7765ee036c5dc2cec329
font_01_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 10740 bytes
SHA-256: 27045b197fa06c7c43e54d06ef8fdfc188f570428551ffbbcb26cbe407218c12