Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbaed8aa2879cdf9…

MALICIOUS

PDF

75.6 KB Created: 2021-09-29 00:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d900df3c7bf18f4105dd3044e2409354 SHA-1: 36482964203ab3a7f59140adc1c49045c510cccd SHA-256: fbaed8aa2879cdf9c12470fd1c525118398ffd101a1eaa6b38531d199058afaa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features multiple heuristics indicating it's part of a link farm pointing to compromised websites, likely to host malicious content or phishing pages. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161417e3fd54ad---kujizewuxa.pdf In PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/37068680373.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/musaxovasoweridujorirat.pdfIn PDF document text
    • http://jph.kr/userData/ebizro_board/file/febaxutetovavaw.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/63830672499.pdfIn PDF document text
    • https://filetorme.com/upload/files/27590888567.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/tudozufi.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/sugibepu.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/xoxudidoxeponuvuvumenofil.pdfIn PDF document text
    • http://kdesignuk.com/userfiles/files/taxalatapuvasavinulo.pdfIn PDF document text
    • https://qkon.ca/images/file/tufekedafibetosekanikuwi.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/59576569416.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/zepis.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/85146119863.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/65h0l0jt8g5ot6nggrmfg76fsp/97400476468.pdfIn PDF document text
    • http://ux-school.ru/files/files/87059176192.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/29235953327.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/nekozibosa.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/82527023285.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/momomelaxuve.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/fibivowuxupokesajogug.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/ruxade.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135e1925ca12---siwejusapetafevigizedeta.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/limozajerodemigabu.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/14706451842.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/voniroxexisuwiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+walking+dead+volume+32+pdfPDF 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_off0000be37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE37 18856 bytes
SHA-256: 52862c6441c58dbb33599ef190b11d080edc7403e1245120d52ec15025eb550a
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 11176 bytes
SHA-256: 676b401f3b6a66f880819281f7a4a020b8770c1cb31a579d8e1bd77ff046dd13
font_02_sfnt_off000108e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1