Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98cd23edc6d7a1e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-15 09:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd7539e3480199b4dacae80e03cf4224 SHA-1: 1283eaefc622f4e3a4e4dd2b2066dc8106ee13e4 SHA-256: f98cd23edc6d7a1e4cc52e12363c8953ab0c32828ae438cd7e5a307c90d54bbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains. Heuristics indicate this is a link farm, likely intended to lure users to malicious websites for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://beamstraffic.ae/amb/userfiles/file/80514549379.pdf In PDF document text
    • http://ajtoablakcentrum.com/_user/file/1492698138.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/43884423239.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/56850801007.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/97101390114.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/nodajevofajuzo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d6a503e6310eeab526ba3b185aae1c4c/xekirigewolotifuwiguposij.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/savoxepiwewijin.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/ginawaxamaratito.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/disezonogirebaj.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd04242505---95897784927.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/2594324486.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/88181380631.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e450b302da1839f1ee0af6b1543f59ae/42818667776.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/jaxipofuwixawukixiwut.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///wivomurowe.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/92544718778.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/fumovexilawiwere.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/90955225976.pdfIn PDF document text
    • https://pixel.bg/img/file/98730801408.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/nasesiwijaf.pdfIn PDF document text
    • http://fxlcd.com/upload/file/71737153340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=office+365+external+email+warning+html+examplesPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/fejemokakuxevadaboruwebid.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_off0000c8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A7 17412 bytes
SHA-256: b5baba78e933c2db3bcacf46a21e1d87b0f740d2020b85ed406958c6e0dcd7d1
font_01_sfnt_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 11496 bytes
SHA-256: b1a4dd975ddf27e0e44729fbf3a53d4854d7cee5e335b1e82617f4e168ab91d7
font_02_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1