Malicious PDF — malware analysis report

Static analysis result for SHA-256 45041aab25fd3464…

MALICIOUS

PDF

158.8 KB Created: 2021-08-04 20:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0df5bfc866b11c39e08f3e1d02d0e85d SHA-1: eaa18d1292060076cb154ededad045492ab52f9d SHA-256: 45041aab25fd3464d03101ce7f2b80888157ddb3602588623854f957d36082e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9571

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://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/u9uo8o78sce7ltvlfffmet4ufo/buruvefexazovaneman.pdf In PDF document text
    • https://childconcern.in/trila/userfiles/file/57171304322.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/pujue8pnssrr9ni48rf1599dj2/boxoneta.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/7fd9428363e0c581349347deac5de431/83018328659.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/reseduj.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/aee95bc84c6e4a1dae9f3e5bae1fbc2d/kutemopusa.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16092a60b266a5---30557419509.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/383844a2e487e9354350fd684ee4d247/6832610445.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3bfbf31f1bc90569b0c6bce6920fac0f/90328124264.pdfIn PDF document text
    • http://getvisa.ru/images/File/wikaf.pdfIn PDF document text
    • http://hasyo.net/files/file/xupasifuvopefavavakod.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/togifir.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/23573695078.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071014c90743---tizetiwomoxev.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072abe4e7f51---rapagunirowojo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef63c8da88---7681174215.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e206211250---96348522442.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/mewatasazinaxupado.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/27126874234.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/297fa1d653992db531251667ba587c01/36013676559.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1qc3a2smpkgdui273i2gdrm9fo/6834245738.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72f3e6b0ae---sivebixuza.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdbdfcd0d8---80280359225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=platinum+social+science+grade+9+teacher%27s+guide+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E99C 11456 bytes
SHA-256: 69a45dadf567403d416082d3939f6ea03e3d293c129dc4e45fed330a94ecf09f
font_01_sfnt_off00020465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20465 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off000219aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x219AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000231bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x231BC 22080 bytes
SHA-256: af1463148173301e3ada01d3796c5fbe447fe17454def1d8a94d87d0b2a0c381

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