Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7a9808faaf1a05…

MALICIOUS

PDF

73.0 KB Created: 2021-09-10 12:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1fb72595d62092f7667dfb48281b2de SHA-1: 60042b7901fe8ad39cee2874870146c280039020 SHA-256: 9d7a9808faaf1a051e8038b841b45e971b81bc1726fa3e58320e8967cbbc07c5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised CMS platforms, directing users to download files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely a phishing or social engineering lure to download malware disguised as a game. No scripts were extracted, and the document body was unreadable, but the link farm and heuristic firings are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134d187b71b7---zokaxoda.pdf In PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/vivigu.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/wusenaki.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/mupotigavapanu.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/49688915074.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/85283968942.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/969015748.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337c42a900f---70475204018.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/zarimij.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fffs2gb3gglo7nst7sq368nkb1/gunobozadomofetuzige.pdfIn PDF document text
    • http://mdtrend.hu/files/file/91166284353.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/57767646741.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/jowedonem.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/fedapi.pdfIn PDF document text
    • https://kar360.com/resimler/files/57663200510.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/jexuvapob.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/nuzajifonopidunixovonuw.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/26628227913.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/88512773979.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/33022700503.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/90859913360.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/62637496283.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sazukatofu.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/kerub.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/85779368625.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/68865141475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=download+game+need+for+speed+no+limits+modPDF 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_off0000bb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3B 16208 bytes
SHA-256: a631424e5d7a39c1b76a2562712bb4ff8d060f45930fd7c89e0a5d3fe11c0b18
font_01_sfnt_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 10928 bytes
SHA-256: 97e48ac2966da4ceff2ba2e3c7cca7c340a850112b8996cbf935cd313b02a39c
font_02_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1