Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb9a328e971ac6d…

MALICIOUS

PDF

87.0 KB Created: 2021-10-06 06:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c4e3fd2c3f42522342aaf4b51eeaf3dc SHA-1: 3611951f2cddb285bc48d289917b991da6f27488 SHA-256: acb9a328e971ac6d6133d9e66c2d77e0f44411567a7d2378c8af3c5e10903c96
164 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Several heuristics indicate that the PDF contains numerous external URIs, some pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URLs strongly imply an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=ncert+solutions+for+class+9+english+beehive+chapter+9 PDF link annotation
    • http://abhinavabhishad.org/userfiles/file/warili.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/78304925862.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/mavalozagufejamorebej.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/13018935901.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ac710dd44a---70521146658.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/40226183222.pdfIn PDF document text
    • http://juha.be/_files/file/73578179913.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/migagefugevugosoli.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/k7bcfso2dbcma091r0a33pdmqp/42658313554.pdfIn PDF document text
    • http://dsraxys.com/uploads/10999024374.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/51777478874.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/4510812757a532400adbedc30b538621/55248512030.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/pipixep.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210901184813.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021105726409209.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/90cd418ae28a77a025f544ad7a90d23b/nixuganixofukedokenowul.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142325f764db---gafokuder.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/14227994566.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/59255526258.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/borarowizesosamodabaj.pdfIn PDF document text
    • http://secretsocietygroup.com/temp/vinney/HTML/userfiles/file/bunutimuwosupasami.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_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 11208 bytes
SHA-256: d73ae97275e1ad031b1db3c40ce42951d3f15b0a03d7a53a07dd6f2d5a324426
font_01_sfnt_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 19808 bytes
SHA-256: 2774c2a02a3f76aa2a60847cefa63bed8823c843e64e4e4cca66ea7f507c3193
font_02_sfnt_off00013610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.