Malicious PDF — malware analysis report

Static analysis result for SHA-256 175c952e668ab850…

MALICIOUS

PDF

68.3 KB Created: 2021-10-01 10:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 451201995d9a28637d9cc5bdf4d92336 SHA-1: 11479a8b7261d6816d02470d11962f785e7a3f0f SHA-256: 175c952e668ab850fb92d1de5c3d243c0104a47bc61673795efba181d9669af1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, indicating a phishing or trojan threat. Several heuristics point to the document functioning as a link farm, directing users to various potentially compromised or malicious domains. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vkts.se/userfiles/file/18579449187.pdf In PDF document text
    • http://methese.com/upload/files/dafasezujobuxu.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/duretusesilujowozi.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/93751904980.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/winakefo.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/55300652990.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/90d9596842c5ebcf01135c4811e85219/lewavanodusow.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210913074739.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/54464596872.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/56553038730.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/50607402662.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/xofiwibawi.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/36771203257.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/34424497816.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/mefib.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/damikajojonefuzazore.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/vefiwina.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/69763146120.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/27726514186.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/niguwufaxasagaju.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155cbf6e4b0a---sibeko.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/84fb6ogspmul457uemmn0fjenv/kewejezip.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210924_225122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+night+of+streaming+freePDF 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_off0000adba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADBA 10576 bytes
SHA-256: 1644075710bf29b68248b1100223df7a50ae9244b0fa8f378472e9ebe45376f9
font_01_sfnt_off0000c5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B4 15008 bytes
SHA-256: a8888bb9d4d69ea6eb2ea51f90b8fef920c6715e21fd0cb311df1699c39f3578
font_02_sfnt_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1