Malicious PDF — malware analysis report

Static analysis result for SHA-256 de67a911a48dcaf2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 16:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e41ad27f41fe09a64b9b58b7e9ac48d8 SHA-1: a8767e6def694d3b7b58b0817bb97b4cb0c7ae11 SHA-256: de67a911a48dcaf212c4abe6870fc4fe3321217564c5fcb155efa07c0c62edbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=goethe+zertifikat+b1+modellsatz+pdf PDF link annotation
    • http://sklepjola.pl/userfiles/file/3249021882.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/dapiw.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/pixokojavox.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744b15c9e38---bobovewudosipasuseguze.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/56889740326.pdfIn PDF document text
    • https://banghenails.com/upload/file/30675811683.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd93d3a768---rojomax.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/62483776717.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/faronedifigageguzam.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/wanunefidog.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/c533a62a4f27731748e1c9a866495aee/30157385433.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/b689c1ec38f802753315962dda73643a/86253471853.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/32028135863.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/14741816075.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/xuxidotopisogoxe.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/gojawoxog.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/97535143549.pdfIn PDF document text
    • http://jar-ted.pl/file/jisasabivisavaxarumat.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/15598160918.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/fa1eb954c5fd24f81d10e2e8462e425b/wivuzekifakate.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/tobaroxoxizefalanuwowanaw.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/83670770757.pdfIn PDF document text
    • http://fotomil.pl/ckfinder/userfiles/files/20142602723.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/69228332369.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/54488876256.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_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 11044 bytes
SHA-256: c124e086f5cfc3ae5bbac549a2d1aebbdc89f730ee2166b51cd3cb750569058c
font_01_sfnt_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 18232 bytes
SHA-256: 48131def2c5122d4e35260a6a46679db05d6d752798536c56785504e9070203e
font_02_sfnt_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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