Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd162c7a3b2aec6…

MALICIOUS

PDF

88.2 KB Created: 2021-09-17 19:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9dfaaf318a53284d5a2d1b4c67d50c2e SHA-1: 5c0ff13b1cb1b59d59470022ec80888803fbe202 SHA-256: 2dd162c7a3b2aec6338287b969b20680853ff6429dc7cdbfc81e98d1743d9b07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The primary attack pattern involves tricking users into clicking these links, which likely lead to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=2+fast+2+furious+full+movie+free+watch PDF link annotation
    • http://tsraccountants.nl/mailing/images/photo/file/46691867139.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6604671ad---rotenenegugowonu.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/23198429873.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/kipiwukutafusebebe.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/pixijosozezuboguge.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/bubosijekinaz.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/19567646655.pdfIn PDF document text
    • http://jswenguang.com/uploadfile/file/58159481387.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/97657271180.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/tatiwidedirovirinubelareg.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6057da7f4b12bf65184caa83a4357c43/nivevefunativij.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/jafifop.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/2271715763.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa97c861c9---sosefamobowutenujutikevox.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/duxibazavad.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/levigodelujerabuj.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/mufumewikejenoladagit.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/wigexokixije.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/30719130803.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/28399856763.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613274a7043be---16541353919.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210917192601.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/40597228209.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_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 17520 bytes
SHA-256: dbbb216f36e34f9d5a76c3ced0e3f5c64793f6ef26a234c7a7e1becf48435993
font_01_sfnt_off0001224e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224E 10772 bytes
SHA-256: 31b5a7da8a8fb4fa67488b3de4af63f3aaa201b2fa8b7ed9c0f739c6887f1686
font_02_sfnt_off00013b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1