Malicious PDF — malware analysis report

Static analysis result for SHA-256 c330f568d34097f8…

MALICIOUS

PDF

77.0 KB Created: 2021-09-15 14:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 91e9f70b56a011ca145970aa7c28e2ca SHA-1: a798ac871d1c969f77f0934d04fd181ba8b6cb9f SHA-256: c330f568d34097f8d1d782ba2b32b45cb0ad7dce78a0d12e20a076aa641c051e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this is a link farm, likely intended to lure users to malicious websites for phishing or malware downloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://allytemp.ru/uplcv?utm_term=dj+liker+2020+online PDF link annotation
    • https://thefencedocumentary.ca/adminfiles/file/28839241616.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/vonepidigapedadanojodexag.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/bebiridoviwit.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/sekozujazituwirokato.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/98275373299.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/poterub.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/nifuziw.pdfIn PDF document text
    • http://epicridesnepal.com/files/nogimajokalowu.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/45591984076.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/30748586647.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/kitidosaniwaralu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/c556e4cbd455e21cb18eb199a4ecc8d7/dubuxiwojeduvem.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161402d30ba45b---33078686340.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rii10ccpdbtasp7gvc1a264nru/24186180212.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec2ca98880---16218129503.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e4b64fcd---33586549227.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/razogolune.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/8mvlfdfc27v1o3g06i5p41flai/94503486149.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/bidatopemuporipifinupefud.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/66pd4loksr3tqt39bqpv6tbbbv/43773644425.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/jepasub.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/razus.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_off0000c9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CC 10136 bytes
SHA-256: c6145ef7923a335085ef2db1b50cf6067cf6093c3fd1aedebd1ea15428eca86d
font_01_sfnt_off0000e075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 17984 bytes
SHA-256: 7793be950164b362e6fe9bdfe544130c6f5be2b9c348d359285307900c318278