Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fac882f3e7a1864…

MALICIOUS

PDF

67.5 KB Created: 2021-09-20 20:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec96a76a09dc16fa4ad0234c3efe5217 SHA-1: 440797976664025c84fa68dfadf011bebf853de7 SHA-256: 3fac882f3e7a1864d4e08072abb86c9500409f7573ddeb2d111a8017531c3c83
132 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. It also features a link farm pointing to multiple external URLs, many of which are hosted on compromised or disposable domains, indicating an attempt to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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.
  • 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
  • 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://rainbowfurnitures.com/files/files/fisixesodusaja.pdf In PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/ziwibife.pdfIn PDF document text
    • https://matricula.arendic.cl/files/wakugazu.pdfIn PDF document text
    • https://anjingliar.com/contents/files/wasigepexo.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zujotagaralevure.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/linitubakesigeve.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/81438232687.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/kakawifavutetororeboker.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/69051536847.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/movasugej.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/33283194037.pdfIn PDF document text
    • http://k1a.ru/images/files/file/69218867947.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/51046838005.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/sekezoxajegip.pdfIn PDF document text
    • https://wsbtitan.com/images/file/65606914315.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/355555433.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb5f1478ec---48363118494.pdfIn PDF document text
    • http://pronobile.de/catalog/file/bopisam.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138301608d92---86647283739.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e63b80d308b05fbcd1521190d3fc01e7/16978621493.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/nawetawirunumun.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/10897729784.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/22040045650.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/dokogifefidadoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tumile+apk+free+coinsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 10696 bytes
SHA-256: b3947b42ac37faf864b623729457d9ab084c018bb79ca5596d793ebda2de46e0

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