Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1eeb2dcca14e51f…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 12:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d5015ca55129ba3dd1636a1aca8a3278 SHA-1: 4bfac706bca42ba56b31f0c7d341eda1b7a7ded3 SHA-256: e1eeb2dcca14e51f6125fa80f69dc2ab6145e078709dff7df0a13504e6fc8e14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to compromised websites and disposable hosting, indicating a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://fgcrubochi.com.ng/ckfinder/userfiles/files/14875559245.pdf In PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/lajoxosesikuke.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/37910340805.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efe3146e75---gebozizezetazejixobo.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b08691d9e7---71123865423.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20211001075020.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/lerutip.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/09a6aa176261b0e2b1140149864319e5/87653966215.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/kazetado.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/21441617503.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/jatejitaguvizi.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/69606129821.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/vowikefagefitaxuvi.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/7475989725.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/rapatijetom.pdfIn PDF document text
    • http://momsystem.ru/public/file/monanekuminawejukina.pdfIn PDF document text
    • https://netlandschool.cl/files/janubegenevobegiboje.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/vupesuxamewet.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/xubowosakufujeg.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/32059838854.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/71647343118.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/roxewuzenamemupubiwu.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/40390361172.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/57305335799.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/74728120824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=a+discovery+of+witches+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_off0000b1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA09 10652 bytes
SHA-256: 866d85c8ae2a2b301b7385d0d9bbbfc1c570f4daca6dd035858f57dbe820384b
font_02_sfnt_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 16460 bytes
SHA-256: cec276a9ab6db5af60723c2be4cf82fa1c6d1f8c02475c5b5b21ca657d5fe72f

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