Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1c2cd877020046…

MALICIOUS

PDF

98.5 KB Created: 2021-07-25 20:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0161b285bd7fbf921828e2e5ac01c03d SHA-1: 7ac57b1bbb1c5d599b43eb14c7d838b15e315e86 SHA-256: 2e1c2cd877020046d608862901f31029b9edaeb45c789f39e588de87cef55734
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser update or extension. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of the PDF viewer to execute further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://sunarchegypt.com/userfiles/file/43280371352.pdf In PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/97690045207.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/jeviwalos.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/75452131554.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9826dcee---97904926729.pdfIn PDF document text
    • http://vodnik48.ru/content/file/dopebujumijelupepavem.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/dazekukeminogemex.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/fupew.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/vslqfm8uuseu6hf603hedbrskl/85125170917.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/823a2a6c3e9a0b49073d8d5e3f5c0d02/kumidarukipazudupixumod.pdfIn PDF document text
    • https://datajournonepal.org/files/jibuzijewupapegelo.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/795cb4qn3cjhhh45702rl60kj0/girofadibulibulu.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/89514444785.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/91692097755.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/b387c25a6daab74ba2f1f3b026586f82/55755046772.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/napomemefotuwaxajetufoko.pdfIn PDF document text
    • http://zzquansu.cn/d/files/90909994452.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/32525411073.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949da11e0a9---loraxovini.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/h1gbv4h6jndg74sdatn1rv32eg/memifilek.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607951c6e8150---4119007028.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0228725db---28529398804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=paper+io+2+unblocked+games+911PDF 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_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 18640 bytes
SHA-256: 71c63e98c8cf08d0bd21abb84e7ded9b2c43facaf8bda27d2d985ce3258f1861
font_01_sfnt_off000148b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B2 11432 bytes
SHA-256: dbc0a8a0cf6a2a8b2b1847627badf8479807d8d26902b105b18667e978221258
font_02_sfnt_off00016350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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