Malicious PDF — malware analysis report

Static analysis result for SHA-256 088e11c04d372c7e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-15 19:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd7f307e14feb93f30ce54848f57bcab SHA-1: e56e0553969dfffae95af24ba6b72b90be3c03a3 SHA-256: 088e11c04d372c7e76371d8b5ef9bd3a2ed6639a5ce43075cc14fa18d5fdda96
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as link farms hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier further indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

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 http://tetobox-budapest.hu/uploads/files/wokufeketuzexolotuvapiv.pdf In PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/6565031969.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/bimajirekawirasubij.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/jutovefave.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/lamiburuxokixoxober.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/zatusijulilexawopegefa.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/xowunitemevosa.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/6640981594.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/5e8c3302030ca257f61c948994ba198c/10843424846.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/foderunem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6c0862a5---59590997759.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/bakawexibenoriwapon.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/mofupakabitoxevi.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/88404847031.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/gamarubinelebibaguvazul.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/jaxapasose.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9ng8tgnv5iff111mgsgtobdil7/42305520437.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/81976253104.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/43431046234.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ebb793cb3a59b796ed63b7d6df960eb1/kuvuvitoxab.pdfIn PDF document text
    • http://willbramephotography.com/pobemizatawu.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/zuzufabare.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/relokofuwen.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339a978f4b9---vadaramarunogerozebezox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+block+safe+mode+on+androidPDF 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_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 10944 bytes
SHA-256: 5287c7d353192697a724e432ce1fb965ad440bbd40928dddf739952fca0dc034
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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