Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe18fef8e8032252…

MALICIOUS

PDF

77.4 KB Created: 2021-09-26 20:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 45083d0de699e3974bbd28667e178c23 SHA-1: ef61f50c43a261822af496c731edc33f440d175a SHA-256: fe18fef8e8032252b2c1a65514689640563c7f5fbc6359564742eac82692187e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. Heuristic firings indicate this is a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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://cructi.ru/uplcv?utm_term=lyrically+mod+apk+latest+version PDF link annotation
    • http://eventologia.com/userfiles/files/judow.pdfIn PDF document text
    • https://123natura.com/stockages/files/dabobunupepufoged.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/99706557965.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e47ad102c6---rogiwupareg.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/75012569038.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/13145156993.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/82810248894.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/zupej.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109200303513170.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/21304738169.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/11901488118.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/6658038133.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/wadogebarijajaminimavupa.pdfIn PDF document text
    • http://faradbox.pl/files/file/56305061296.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/rupejidotabob.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/kawuzanumoxixa.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/wikexuwi.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/pugef.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/62215354084.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/92110e85117571f99192df143a399a3d/87299363907.pdfIn PDF document text
    • http://4bx.pl/public/file/63813941402.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/p3mmpkak6b887ktv1scp5khlu7/galebexaremolebera.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/dijepipunutimumisalepopav.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/butobe.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/77460150279.pdfIn PDF document text
    • 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_off0000c165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC165 10904 bytes
SHA-256: d6195ed25a31f0eb53bfd13ec3d2f652bf9d0d690f4a7c3d6f4c3c9e79ece3e3
font_01_sfnt_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 19696 bytes
SHA-256: d450457146614d3e99083cadc3dac85ec4c3b538f316a4354c3e216802c17961
font_02_sfnt_off00010dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1