Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba645751574753b5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 23:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab88ee7f2d5ca33c4c4d238eda58ad5f SHA-1: 770885725dea823a8ca6eaa3764e6fa34e194f5f SHA-256: ba645751574753b5d10e8c0ec461aa94f7a87e28f966c563f014e5c0ac73102e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to various domains, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware disguised as legitimate files. The embedded JavaScript is likely responsible for initiating the download or redirecting the user to the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://thewellmanteam.com/userfiles/files/vesovepowo.pdf In PDF document text
    • https://mogilew.ru/userfiles/file/tixurijadofuj.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/33979549304.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/powasefoxovafanu.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/55624353166.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/tigenu.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/40276597588.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-16-17-56-36-71.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/wojelixuzixinavugisowa.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/wemeti.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/70401052081.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/61611676728.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e6d7c70d70693d2856a39cde44405d34/ganazinudelenusikujaxajis.pdfIn PDF document text
    • https://matricula.arendic.cl/files/8702442789.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/36356969310.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396f3de342e---tekefofatekilarinum.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/rinatoj.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7625899e3f3758de8aa6afb62056de94/38548837159.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/kewivirinewatozabanofatex.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/gobujejejepepigiru.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/66232696838.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147143083fba---96935207546.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/falisewenuvumokijiti.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/jenenasivugofuxarunalip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+gta+4+mobile+apk+androidPDF 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_off0000dad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 10964 bytes
SHA-256: 3077972e63efd61885f1fb4621656739023745a4bf5fe104a7b007cfb937b79b
font_01_sfnt_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 17784 bytes
SHA-256: b8e524e6b3a7c4aaac3bcda7bddc69192b5a870345df58bcff3995f2429dd9b9
font_02_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1