Malicious PDF — malware analysis report

Static analysis result for SHA-256 675a85f13a616c73…

MALICIOUS

PDF

71.8 KB Created: 2021-09-06 19:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e926d55ff0b15662f7f864b85fbb5eb9 SHA-1: d38c2363108ad4356bc486ce6d9b314896ca07c1 SHA-256: 675a85f13a616c7345544d5b6c2004c9952e8d1d5b8ee79c60b212dc6c77e090
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dejede.com/userfiles/file/wefemoteseneg.pdf In PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c6a85ad6e---sofologitifavunovuzuvepo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/redunatode.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/mmb406fmgdk01820dv7bjdco46/rexoramuvinenonoweto.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa6a88b0c---logubozugaregudusal.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/pivogutexusuzagerax.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/4154915683.pdfIn PDF document text
    • http://ping-property.com/user_img/files/juzexonazodinofuludipam.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f1cf2c9b4ad8f5f691cbd72220bbaeaf/suporugorinezorunuv.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/dasira.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/50774815542.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ea11ea683f986c8fd7d3b23fd9b1c19a/82916805248.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/71977182743.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/durubotupozapobakotexiwa.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/70175766ad6dab8240f430d2aaa1f775/ramopadefofafumat.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/zarirofiniwixilobodolebas.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/fff2af2b7d3eb475a865ef6a0a92608a/vadokowubeguvixewiw.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/wetelupufenaporumekuje.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cf24748df---vanapevejijibazite.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/75969196070.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e49b5a7e8---bobuwujotagekotazugaxap.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/suwokojuja.pdfIn PDF document text
    • https://unosms.us/userfiles/file/6566486654.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/39a4c26ee89d60378276a204fd94b191/loxek.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48c2f1ed0---8620920663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=strange+but+true+stories+of+the+vietnam+war+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_off0000b93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93A 14880 bytes
SHA-256: 575bdbc35448d334504e975f3c86cfc7dfc3d3f70f5683f4f75f68318214b0a6
font_01_sfnt_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 11364 bytes
SHA-256: 7db95b3b3ce0a08d83c24d4b95b9cc22d5b47be0877cb1cdc19177c6ad83f76a