Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f809aa6cd6a1ea6…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 00:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: caee1fc051513149a3d5787b39404edb SHA-1: b447e430726d76c5c5f399b8bd0e7e36bd7da853 SHA-256: 7f809aa6cd6a1ea67666dfda712a241c891601c57a74ee96bd63e23f7d8ae902
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the true destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://tgvl.in/uploads/fck/files/xurugibemawabalukanuwotal.pdf In PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/vekobetowikefitevikulaf.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161465d43696e9---mazop.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/39618067440.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109160432189278.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/vexikisifubabagolinifox.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/2588388009.pdfIn PDF document text
    • http://vitcongiong.com/uploads/files/lozekanuderuvumenul.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/54621005074.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/vaxatafetutanuvefijulugop.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/24879644767.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead83ba9c5---votofoze.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/nezepavebi.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/rujemuzefezedibuj.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/21565871680.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/xujeperume.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133b461624cd---janimotopelosepigab.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/80634981415.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2b0ad2598426d188143c057c941d6f44/39016965646.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/lotudirevigit.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/sapajemivukewed.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/kenebemixabopovazotijide.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/sutuwenemofavasakowa.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/68181290342.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/56484373341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=watch+life+ok+serials+online+freePDF 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_off0000e13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 10520 bytes
SHA-256: 5f87d8d163fa29cb9108c01951bb7f18888528189f45810279ec95928b9b62e4
font_01_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 17288 bytes
SHA-256: 134c6f2a07529d5900910e5ce8c5bc81fc1867e0233423d458949e0e687d7ee6
font_02_sfnt_off00012570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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