Malicious PDF — malware analysis report

Static analysis result for SHA-256 3911485a717b59f8…

MALICIOUS

PDF

97.2 KB Created: 2021-09-10 23:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9ddb029903a3e25daacc9bac2a398099 SHA-1: be04f23a3e4abb6a44a8a84aa7c4cae451ac9966 SHA-256: 3911485a717b59f8fe8f6db2e56796710b20e8fa8fa89766f53714afb8e77e26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the presence of external links and the nature of the hosting suggest an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=best+antutu+benchmark+2020 PDF link annotation
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/abc0fb3af16ebe979073f0d6b3e8570a/10599481935.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/gexapusulivefasib.pdfIn PDF document text
    • https://bloomeng.com/uploads/lixem.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/sorawikugebodavirumadov.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/tejanefikixowiperusikag.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d923825cfbf3224133e3cbba5a0f28b7/16727961192.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/mcfje4dgql6ljgf22sqojtu53u/pewol.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/45603246118.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/37912125168.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/peranafi.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/nagolazigaxarimekut.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/tezoxedorajodenutozo.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/xerikolidabez.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/gazawamamogok.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a826654127---88994108416.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/70766476950.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/dazabominolegesumexowo.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/faguvurebuzakobegitapoke.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/65735098801.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90559dc46---16737406724.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/1764572596.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/ditidivasabad.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/xakexova.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/giwuwolas.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_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 17800 bytes
SHA-256: 63e4edc19bf5676a89ab11d1d3f348591d1e6cc20d9b97aad3d4933bd34c9411
font_01_sfnt_off00014622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14622 10864 bytes
SHA-256: 63d57575e944187ae3763236f070df8b8d243652d6b0a3eac0ef76bfc8347972
font_02_sfnt_off00015f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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