Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5835d1b4ac030e…

MALICIOUS

PDF

106.3 KB Created: 2021-07-29 17:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1502011ec3b47654e2e09922ae60f088 SHA-1: 8965791befd266fe1513a79b4e09209774dc11ee SHA-256: 9f5835d1b4ac030ed33435896ce24dda85745b8706472c81e294d75ee24fc602
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://symbioticlifetech.org/attfile/fckimg/file///202105312757_505018275.pdf In PDF document text
    • http://berbun.com/user_img/file/zonumamotedejopanix.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/befd336c58309de51fab74b7a646e03a/79217467845.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/95762143991.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ef9ca3bde---bukofol.pdfIn PDF document text
    • http://iltorg.ru/upload/file/ravaja.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d3308a563---tapalotonowanakurubasaxen.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/selevelamizusu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719aeb4f084---tutexivoxezagopa.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/45124393116.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/dbb41cce5160d6d33a170110de2c9ee8/84879395275.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6743b3437---putinugitosi.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/48368454318.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a52587e5---34426219975.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/aa4c3f29dd927ace52a1537a0b9ff0f7/46652476568.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608068c225fb1---latuvizigepunigimifuf.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/30973696627.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/kobeteremuzoxonagobad.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/tpub1idpn8g95mpc2hgg1lq3oe/jusazara.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/69224004624.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/3030463657.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/83102462126.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d76190a5---gidujugasuko.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0726b3dd5---lakujutimojasaderorodex.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/44924534706.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e323ee40f---velovogasufetixuj.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161005f08cca89---tigub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=grand+summoners+vitz+guidePDF 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_off00013874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13874 10808 bytes
SHA-256: 11a47d76de81ec779b0e458000dafa57d8b7ca884f269ff6b812d585b0f3b7d6
font_01_sfnt_off0001513c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1513C 18408 bytes
SHA-256: 7bfdfcf9b776c371c42e43da771029cab2c8f4701549312320d6665eaac0d20e
font_02_sfnt_off00018103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1