Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd4839875abc6f9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 12:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74fda73d6eba6ec4449c06a5c4697c83 SHA-1: 8e0d51364957a392bb6103f495ef229346b441df SHA-256: 3fd4839875abc6f9efd85829204ede0aef8db0eb72c02e707369998a0d8ed0a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://archism.ru/uplcv?utm_term=farming+simulator+16+apk+hack PDF link annotation
    • http://beta-rc.com/upload/files/tetofovamisekokujudetomo.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/75722953450.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/58125087642.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/gogogolusof.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b791e768bf---92800683900.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/wixanenipawatuwubi.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/69039858798.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142b44ac33a8---fototuzarenab.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/89424588893.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/kowumedopuxus.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/midunuzaxuweworogawimago.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/17185266426.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/64dcd983bc5a70e114201b09c0cdb60b/69126583240.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/volazoj.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/30195086397.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/99477551029.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/762373426.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380f75eb92c---fezuxesumapoladogebutimig.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/gewemabetorezor.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/9534293713.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/94316491739.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/wenevaz.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/71152109666.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/56892811293.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/bosinewazu.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/beter.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_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 11080 bytes
SHA-256: e4bd3ab8cda0ad9ef6688b9929b57c55537006d968104549f89f2a67b706c2ba
font_01_sfnt_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 19424 bytes
SHA-256: d9150f0dcd0e2edab13faa386d7b7bddb4246ba5307d2e42d4efc76bb74e049c
font_02_sfnt_off00012684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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