Malicious PDF — malware analysis report

Static analysis result for SHA-256 c413aff6d94aa648…

MALICIOUS

PDF

113.4 KB Created: 2021-08-12 10:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 403c5b54fce0ab76cd263514b04683ea SHA-1: 8e1e0bd008f0fafdf7cbaa05288326bf445c2b23 SHA-256: c413aff6d94aa6485ad9702ff6738967b324dec0c3df9523448aac05815b9627
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9598

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://nomylo.ru/uplcv?utm_term=how+to+download+fnaf+6+for+free PDF link annotation
    • https://hyosungulf.com/uploads/file/46272638592.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/jureduwam.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/54ad31655489182d5ba938a2bff04ef8/97123105495.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee587ad7c6f---nujog.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/17889115560.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c80219ca75---pozararenafukewanibavo.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/dezojulagesuriguve.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160722b683d554---18505197291.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/vewajifodujowipad.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/52619529552.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/77941546897.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab88c0a41---kemumoxekole.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/nuganopuvilex.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/31845044625.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d66db082c5d4dd4584fa93558528db30/70184986956.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ee48562c860e86304c3dc8603b983f83/3384845884.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6794f3ce5d---masavopomade.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7f60120059494c4e982f2482e25a589/jowufipanifepojus.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e426a899---82595018338.pdfIn PDF document text
    • http://katachizu.com/img/news/files/zixepokexukebejudita.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/26724072255.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/85477568504.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/31743397211.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073e08c3d12d---letuvofetapemop.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/42240184716.pdfIn PDF document text
    • http://adveotec.com/img/file/66829664685.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF7 20300 bytes
SHA-256: 2ac809de24f29a6410fd1bf25c2c450e09940c3d520e9c36552844530534d65c
font_01_sfnt_off0001711e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1711E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18935 10332 bytes
SHA-256: 951044e9a3b154455ca8cdc0b44e8169c60857676123848ee39354571e63e11a
font_03_sfnt_off0001a0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0B6 16424 bytes
SHA-256: e18d6dc742fe41b6470c83276a17d8ab53ec178fdfea159b60d283ca24d0ec59

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