Malicious PDF — malware analysis report

Static analysis result for SHA-256 374b1e09f804b223…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 20:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b4ba80f97dfdef4c4b55561b8e732647 SHA-1: bed64f9888ea5883b165f80bc470ed6682433f0a SHA-256: 374b1e09f804b22350b929b61c927eb5098db609d5af7b102eb3eeb05310604b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, presenting numerous URLs that likely lead to further malicious content or phishing sites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates it attempts to trick users into believing they need a password for an archive, a common tactic to bypass gateway security and deliver payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb196923109---rikasizalag.pdf In PDF document text
    • http://wsm.hk/images/files/lumozobiborofijuludalitu.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/83840969993.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nisokebamiwezov.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a737dc01248---26191237293.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210831140115.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/javebegunevenetabozolot.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/37639117027.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/11412614483.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/ruxararumipanedipenikakud.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/74812798014.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/76543002186.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/2106290014551412763ml72.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/hds90p6h3m0nn85l9tp41vbbq1/45042702189.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/xoxojetexatitodavu.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86607501465.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/barovesalivekaboniwomuz.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/58976733392.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/16536724898.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/zexoxudopidexiseg.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/66417582407.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/vurijibupigev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=wondershare+pdf+password+remover+free+download+full+versionPDF 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_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 10908 bytes
SHA-256: 62d490432e07660b20bc6df70c9f9508b029e9a4db02ad958201108d14b4c642
font_01_sfnt_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 17980 bytes
SHA-256: 36c258606c36f684ffcb7d0441accd6eb6ccc3bbd5e712289a2c21032182314b
font_02_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1