Malicious PDF — malware analysis report

Static analysis result for SHA-256 803b09744308c8c4…

MALICIOUS

PDF

86.4 KB Created: 2021-07-22 20:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7349ecae4923669283005ff007d68970 SHA-1: dcd930b33f3e7516ee6f5a517b636f7d74cd0f5d SHA-256: 803b09744308c8c465bc3c2263eeca9f7bd1bc07370bff92b799c85fe89190a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest potential for JavaScript exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://gdbchurch.com/clients/43262/File/solapamupikofepupetixin.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/43e502d2526db88898404cc74e06acc0/63425471550.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b50f4967c---41479189708.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/lefapexoke.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/15490495719.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160baa799ba938---jifamapimorurasemi.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/84146444029.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/ce6a2b57af945b28706d05cc823cc2cc/torozodu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2de544709e643a0887c79d76a2ba8cb8/94773154489.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/fanavumaniwakenezedak.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a6051ade570---87640133480.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/bfc632a7a77e8042253c9e53b6577b1d/fedagegatigiganadibot.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/761600669.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/lumonevowizu.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/24049370106.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/worexig.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3891f845ed---74305730853.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/52550026522.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/656dd5fbba01cffdf81d14e7167a9fc3/14004191872.pdfIn PDF document text
    • https://arerp.kr/data/file///kapapapawapozozeluv.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794c7ee003d---pakibasalagatuwudonuvilum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=introduction+of+ratio+analysis+pdfPDF 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_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 10644 bytes
SHA-256: 9622224f119b75834266ae2c7642384bf2522e24394db6c0d8fb87f481a256b3
font_02_sfnt_off00011c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3C 17268 bytes
SHA-256: 91c26c77d5b498335c8993823265082134f40c215f0e15ab7546181303ffe8db

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