Malicious PDF — malware analysis report

Static analysis result for SHA-256 9886c6bab02622e1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 23:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb5131dfbfd019a93986b88cb80baf72 SHA-1: b7d1c15222b1e9d21b27d24ccf284401331ea44c SHA-256: 9886c6bab02622e149212ef8ee55a70bdf1f81f260fa55dcc5a6acf6855ccc84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to malicious websites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gesgo.de/userfiles/file/57226884052.pdf In PDF document text
    • http://datacomsystems.cz/userfiles/file/43753540301.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/k5hui5cuqv2ob9sbejjcloongf/rasorujuduzo.pdfIn PDF document text
    • https://servicepapik.ro/files/88783345641.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/tokuxawinojubofifizinifu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/22eb149fb5dd16051d4a578b54a9dbed/wamewe.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c203ec94734---tuweluxukerojaj.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1629593234.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/zilaz.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/09f77a7122c2cc6cc86db6b7a038f2ef/dabibukujifozegazuwarefa.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077a346deb13---50951049184.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/23891710659.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/patomikotegewerapebosopon.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/fukizogevozukuluna.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c2ffc0efa---wuriroxafubomo.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/mekewixuborakufemoxuzuxen.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/39145573186.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/84880931136.pdfIn PDF document text
    • https://campermagazine.tv/public/file/520222906.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ebf8a3c15---wewedesojejusivugu.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/8d7098f6251f54c49ceabb1f25f97d8d/58793023746.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/zaleg.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/wadosatomifasogaxizogop.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/30d8a4a057912c9646dac69884f68af8/30039386970.pdfIn PDF document text
    • http://elitvorota.ru/f/file/gerupolosuxonajesimuxox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=photosynthesis+worksheet+8th+gradePDF 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_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 10984 bytes
SHA-256: 34b8fa51d08c94b7c2571ddd5eb4a3049c23c1d882f6b2db8adf53f010414efb
font_01_sfnt_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 18464 bytes
SHA-256: d80d37c9a4c9bfb0b93040adae57b839574c12c3fd5b0874e769cc0e9135c26b
font_02_sfnt_off00012152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1