Malicious PDF — malware analysis report

Static analysis result for SHA-256 116e0e75163534ce…

MALICIOUS

PDF

76.8 KB Created: 2021-08-16 06:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 858544a1639f0f1bb024c9f431c2f3ab SHA-1: d13746ef79e397699bd8f1ac3b91e0687ba3d557 SHA-256: 116e0e75163534ce47d974529fd4fac6782d13d312e4d142231d1778a56b1bd9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable domains, suggesting an attempt to distribute phishing content or malware. The PDF structure and embedded links are consistent with techniques used to bypass initial security checks and lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://apvn.info/userfiles/file/wazumolojizevowinud.pdf In PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/50379a02242bbfb62dd290ae301a71c4/76049614003.pdfIn PDF document text
    • http://skomi.ru/img/files/file/34275792729.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106e2c25c2b6---wekajuzin.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/zuzimefevazagites.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/28311087697.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d84092839---1841659953.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/he77496mfja1d7q21ggv1hbbd5/pemokivekegamusajeziginak.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/befikajuxumo.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/35119477476.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6facd93dcc---vikavaw.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60fc71e259833.pdfIn PDF document text
    • https://posh.hr/files/69244936939.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63246e554---41453384429.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608315c9d9656---vubarabepabuxukuvanelawal.pdfIn PDF document text
    • https://codecs.ro/images/file/wejivinesozuropiv.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/1627dfb7e737c52a7f9693742354eb0d/lawetaxexoniwixarajo.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/76383396248.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/aca422293b0059a7921fa4f6332204e7/vanifosina.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933c1ac05c0---ziwulasakojegufowuz.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/zudobodelebelutuxutel.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/83255190483.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/79849490374.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/koferozimodawon.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1027679a09---velugubulelifene.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/negaguruwapuwaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tamil+novels+free+download+blogspotPDF 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_off0000c72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 16348 bytes
SHA-256: 2b608029c64afc304a23f134d03f00f528466c3c2ba173a5ed361ea6072bf522
font_02_sfnt_off000109ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 11096 bytes
SHA-256: 7eb03b92ced12be550d7814887ed52744cbe17cbbfa0ad72b03756bff55caa49

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