Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef39eb60c8bff3f7…

MALICIOUS

PDF

86.3 KB Created: 2021-07-01 09:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bd5ed59ddb66c50a998e53061d8d22ac SHA-1: 220fc96602648fc95e5c4ad66e711d9b7ed15a3a SHA-256: ef39eb60c8bff3f753e965d2c343dd4e4cf1b93729f9331247d6e2f964a5bfc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious payloads. The document body is unreadable, but the heuristics indicate a malicious intent to leverage external links for compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://usaoxin.com/userfiles/2021-5/file/dogexorabowojo.pdf In PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/fc1a9dc2a54737efcf2a505e098419a7/43518676081.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/42774022467.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8ff07f3a---tatujelem.pdfIn PDF document text
    • http://zerosquareonline.com/file/kalugezosilazabifoxuxis.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e549fe65d5---39283964427.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/visaxefilap.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/49e26d2c9d1e135a0221e882206c0c6a/35936166485.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/38963458898.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8ceb2f92257359a9f096a006e4511569/kaworego.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/8cca9fa90b903573f98866bb32f9b566/wuzaju.pdfIn PDF document text
    • http://allycatering.com/userfiles/fuvezetoxa.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c955760918---ruxikegobejimezawij.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/570a7f0727a4b73f85dcf56878d8c074/93120153357.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/r6sppc57cmvekkc558rus0sj4i/28926489687.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc608a1109---47532206407.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/jerunazol.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///kavitawev.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3b2058e0---98629993016.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a66467802aa---65821654591.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c63ung8qbh0tupsc78shpkvlc7/pogemiselexazox.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8639e5127---31693524982.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c73390036ca---3242973471.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/60552618316.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160774805ded3f---zitavupidovejevoluxana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=to+clear+the+airPDF 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_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 10020 bytes
SHA-256: a2d45d96e8b9bdb04b71221aa77ed92ba7de186872fdd921642cd18b699419de
font_02_sfnt_off00011f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F90 17112 bytes
SHA-256: 428ff1f509bae86091accee767f902a4a3061e46c53b1bf88f4ba197de151e75

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