Malicious PDF — malware analysis report

Static analysis result for SHA-256 8584638c7085b233…

MALICIOUS

PDF

72.3 KB Created: 2021-09-03 07:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1490172cbf54cc361f961d22dbf9659f SHA-1: 53d009042ebf1559065ff4f302ccd3cc5858a9a9 SHA-256: 8584638c7085b2336c119b4690a5f7b8b167e8c4727137b26d53f873afa75def
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=yoshinori+ohsumi+autophagy+pdf PDF link annotation
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/6fc371e8075ed98f3c2b4b72c3159403/7310984901.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf0fc3804---bosezixozuv.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097503c7db16---24501042334.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/n4d73q1oc3ohf6e16n6qgvj4ea/fubenulaminogija.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/liluz.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/vapojafokifiraruso.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/tewetin.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/tugugokamitizolawubofu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/31ba5b5d8c8f7aa1adc8762d5259c3c4/16588427124.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/wewajitutusiniwomug.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/7b0003389a3770e027c5350b7b06748a/39480868435.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/fuvoro.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/85943361153.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c633ebe02aa362367cc61f5fb01e1fdc/sadoxolugafuli.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1430df68---tinevivub.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/70876235992.pdfIn PDF document text
    • http://gyobel.itpublic/file/44684967094.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/bp6dvcn81vrc7n0hf45jvu7k96/93920106091.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd32d8ce9f---87765898301.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/156ea39a9e0c2bfd5e747916371e3d1e/bivudika.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/33964974721.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/75982564787.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/filulejo.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/84749867791.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA7 15708 bytes
SHA-256: fe6f871fc9bab2385840a7ee11e86256a92a73bf117859c8cc224f4755eca948
font_01_sfnt_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 10964 bytes
SHA-256: 149dea03a93437a432fda301ac515750266bda7ba06c1c2bfadcc7645a21cc97

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