Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7949b2271814103…

MALICIOUS

PDF

73.3 KB Created: 2021-07-13 15:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1ff869b016da73eca8ab14e8acf14def SHA-1: 9242cb6abe4792d99f128a767a05a541d1998f69 SHA-256: f7949b2271814103d9da632ce0593be75561772a7e8cfd448dbfa72d07fc2e16
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. It functions as a link farm, directing users to numerous compromised websites, which is a common tactic for phishing or distributing further malware. The presence of multiple links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hytechplus.com/userfiles/file/fovemubevelisavikixaw.pdf In PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/520cc64a7a47dc1c436fc173a84c61df/15712720910.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2f2d15b4b5bcf966c9697ed47b7bc099/latijozofuxezusozolalo.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/nuvuped.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/zawiga.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/36bd4e6cfbda8e1dd97b41b7881709a5/rotewaniwona.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bomewinorakalos.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae935b74c2---vivudomugipok.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/85b19c220657c2cc56f247fde3495467/54255461419.pdfIn PDF document text
    • https://webmenuplus.com/images/file/47968553241.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3952f33e6998b57778c94d7f003f7fa2/tilubefopajo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802834a2877---neson.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/10032185332.pdfIn PDF document text
    • http://e-hematologica.com/users//file/45105810610.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1225fac3f0f313591b8295abe7fe0b51/42380796120.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/14098404370.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6441f22e8---52568252520.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/losoguvolabewu.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/70433433682.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/xinadefitewolalomuv.pdfIn PDF document text
    • https://ebooksweb.net/files/file/sazewupazotexaxoti.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/2a4acc2898263103bc5eace1771d392b/fuvejufofomo.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ovsi64hr2cob1bjn9ha26hr9t2/naninaxobibegibapas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=concurrent+execution+of+transaction+in+dbmsPDF 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_off0000bde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE0 15696 bytes
SHA-256: d3f8076b5008a2543f94deff2f1489ad2c040e433a05bd264992266df78130c7
font_01_sfnt_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 10964 bytes
SHA-256: b36879c0f6c4a185441f1ff4874778a5e1cebf8fd41067a986ddddf02afa5312