Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d19e0b5958114fe…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 05:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ca073415cf4cd3a8c015be48dd4c5d3 SHA-1: aae851e9d08bed003a0e358fa44d09487250f707 SHA-256: 4d19e0b5958114fe3663e67d79479ac3832c841be5f8db515b8d7940bd12dfed
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. The primary purpose appears to be redirecting users through a chain of links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f04c384f52---xilabitunemapadisipenizi.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bc9159ecc---31793436116.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/65201695250.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/lorupesazevekolebosikux.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/1b06c271e89ed06c22e23c777a803876/6947525972.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/89238984833.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/in0s7dpl3cn7d00m3jdkbn1s9k/31361156347.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/cuc6g57r4jgc30hmapd6c5ea4j/96371010551.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/zavedepakuduviwisunipajuv.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/26289035381.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1610c390db7de6---22200426039.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/89645923925.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/46956942149.pdfIn PDF document text
    • http://schokozentrale.de/idata/dilafa.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/81898198072.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095167280c16---ligunubolokugitofatekakut.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/xilazasirizubofatulitanap.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/pejunutitefagum.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8a9329c5---puditapebolixuganefoxuv.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79ca3d94e2---44286755491.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/5c8388a74ca0cff331501bf8ead40ea7/vababutonedoje.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c679fad28a---8975573640.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98f89d9f08---93829879056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gastrointestinal+tract+anatomy+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_off0000c678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC678 16488 bytes
SHA-256: a624b04f9d6883f64c0b4be7c9fa25d02a876390590d3ebe8753782a28472daf
font_01_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 10936 bytes
SHA-256: 588cc75874b3cc8b8a3e166ff648cb5386b2531f3bd3537c2e3b63e403346431

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