Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f4b0ae09ea4c56…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 10:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41ab3017c970a0dced3ce1587323827d SHA-1: 6786cc5f6a3d06db37ba982302cc29159406f54e SHA-256: c3f4b0ae09ea4c56ff77d161aa4b4d12796fa6e8bdd9dcd4caa2e3dd77ed5d7e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of a link farm pointing to multiple distinct hosts, some of which are hosted on compromised WordPress sites, indicates an attempt to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://esllearningbydesign.com/app/webroot/files/file/99717012862.pdf In PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/20536191439.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/91371995697.pdfIn PDF document text
    • http://iviltra.lt/images/files/lovogefenetakabebin.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/mixik.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324133ee86f---57161206339.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/puxiziwexubifulu.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/57411663150.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/telusarasumamewom.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/4131771453.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/sesulimufagunorake.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/delolizig.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210912101927.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/nanitorozadevotuzawaxoxij.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210912124949_khie9r.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/69900546096.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/musedumivop.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/75230230290.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/8428ff3c3aeb2e6e7fed623d0b4d3a78/37848930165.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614307de17286---foxejoxiba.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ndfgpuluuj50rjhc2t88lsvek3/nevazuvubijorudakeku.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3549fb2ce1f93f6601fd447dee2b8125/letimurorepi.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/wisiwemozetuwowiwupumo.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/pelipijuw.pdfIn PDF document text
    • https://tessuno.com/upload/files/613e477d0f7b8.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/51403290630.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3lskj7olt3ufpjvpsbcbmp5etb/34020596580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=wifi+password+hacker+software+for+android+mobilePDF 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_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 17440 bytes
SHA-256: 139309bb9d135f24104e000b8d556d65fc9e4f15198b4d160e96b291c13196d5
font_01_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC9 11196 bytes
SHA-256: 2a89299e0b168c05e4c7c79c2492192543ae8cb4beea409ac93ccc9243f4dc86

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