Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8063701ebb8f6d…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 20:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 54e155f123a9142264fbc1e63082754c SHA-1: 0e6fd78643fc906768db8a5d0b7385464cf0d333 SHA-256: 1a8063701ebb8f6de2c11aa67419adef5550021826ff87ab70c3a8c730cd9023
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to various domains, many of which appear to be compromised or disposable hosting. The presence of 'utm_term' parameters suggests a phishing or SEO-based lure to drive traffic to these sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=5+syllable+words+pdf PDF link annotation
    • http://ligneus.hu/upload/file/86846257139.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/50691858012.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/f5ffa1a445ce58e36d44bea3ef602754/divageliruriliwusukenib.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/8234078174.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/97ba3347f8cfe93589ff3c50736d1277/16361660954.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608532359c63f---38184655110.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/vozutupezobanalowur.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/c8sdg0o32aadu5cd0tls6l5rv3/30376789713.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/podegoputoketaxozusubuzuf.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda77beb740---levora.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/tijutavo.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d513676dd8---wilelojelatug.pdfIn PDF document text
    • https://securitydm.net/slicice/file/45628865598.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/dogato.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/q8ug9uf80l06v5jpn1p12cnlc6/40310781491.pdfIn PDF document text
    • http://smithandfriendsfamilyreunion.com/clients/d/d0/d05d9bb0b75700e7199fc64e52c62161/File/minomujaw.pdfIn PDF document text
    • http://acril.ru/ufiles/files/gofubok.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/fimofexawanidud.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/91b03451c0326666d7dde89bbacb9dde/merijifimogokifesofalanap.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ef5699a95d583a472d1402252cc4ee14/28029410450.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/dcf67874d905f69d718225e1fe214505/gowebemetefemefadug.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5bf263a3a---43808860789.pdfIn PDF document text
    • http://medica-brno.com/files/74599910483.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/mizonumabatodabise.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/6nged8t1638p2knq0ibrpgb6sm/83286343020.pdfIn PDF document text
    • 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_off0000bc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC67 16100 bytes
SHA-256: 4501421fe0812b56c7b136987a3d2f30e00f5852b4b9fda62672395992f59d9e
font_01_sfnt_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 10572 bytes
SHA-256: c3c39074de174dfe7c84ebf4a6bfda30b61cfb23800942f1c06856f9dea0fcba