Malicious PDF — malware analysis report

Static analysis result for SHA-256 42712ff7ddaa75f9…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 14:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3d6c63054e970aa2ad04ff22073dca2 SHA-1: fa51d1f7eb7ce004cb2dc6eb36f9b6735413f6af SHA-256: 42712ff7ddaa75f93f8f7f3d8ea54fb4260e937d9085feec0caabfcc58b57a0d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/bc1e7e2f0ceb1418964d823746368d24/73452419349.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d41001981---75772192035.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16091371ddc560---tunavujosigurafixexutej.pdfIn PDF document text
    • http://apothepharma.com/upload/files/34400207569.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/vetejonafogimiku.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/diduwazebakiwomekipev.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/wupubufe.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/tinawopapunuwikazazurusap.pdfIn PDF document text
    • http://mousike.it/img_ins/files/89865619188.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/jegagadobenevupi.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/zebedasizipirajaf.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a678fe9a9bc---4803177534.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e86d0931f---54779953183.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2c7265f1db10b0cb80cbee726f153fe0/pisolejuvavejilegen.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/16a6dee1e2216e9b1ed8ad1703f39dbc/780427802.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/lavezirujugatutadetagezo.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/gbk0iemgulfmvnskv93m6c69c3/45340449425.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/6c87de61cc733a98430b469e4a29dc57/jiledijemujapeku.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/f9652d5b18a3b2a97f9f4eff4f7937ed/zumebedelaxifezu.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/47777804794.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/feweduw.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/siteginuporirixilalos.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b759e704739d68902372afba49f1c782/leleforasogadexi.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/botoloxepuj.pdfIn PDF document text
    • http://jar-ted.pl/file/2831479025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=lactic+acid+bacteria+in+milk+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_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 16956 bytes
SHA-256: 005daa40131644089919f5bc42c19059252b883dc854ebbf142ffbbe5eb6292f
font_01_sfnt_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 10680 bytes
SHA-256: 9361a085a0ecec8312a165de5e215248714f817d9bc5e6822c7f015d188e414d