Malicious PDF — malware analysis report

Static analysis result for SHA-256 650fc75b1794fda6…

MALICIOUS

PDF

86.0 KB Created: 2021-09-09 04:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40b7ab30f592f81009b9a8b4cbaf244d SHA-1: 3cfa8a85be17cb7a31aa492e4ebecfb700e1552b SHA-256: 650fc75b1794fda644a8cb203fe733d2f204a2b39880590c21c089c1cc679c8f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised WordPress upload storage and disposable hosting. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137709ee13a5---38731376187.pdf In PDF document text
    • https://tp-pos.com/uploads/image/files/70932275585.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/5073592732.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/60735507228.pdfIn PDF document text
    • http://splogservice.ru/content/files/vubapesasudof.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/96712051443.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/pirutuvixawab.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/beninirazo.pdfIn PDF document text
    • https://tigapilar.com/upload/files/44110500230.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/bakubosomuxaru.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/73780968072.pdfIn PDF document text
    • http://hanleyresources.com/images/54794170404.pdfIn PDF document text
    • https://titishop.co/upload/files/95033920671.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387465297c5---95503839567.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/87784827010.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/24426677480.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/39721411024.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/womufebunugob.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/68192693879.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/lojodegifijuweletovi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hccv0jn1c7gl5sj95fuoigsu34/94410782636.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2a830650---riliv.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/lukodopezasazevubonexitu.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/gatoj.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/59991667160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=call+recorder+software+for+androidPDF 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_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 17692 bytes
SHA-256: 21c2dfb8e3ef606055e3bbe30684360a830892daf6b8fecae326603962811d07
font_01_sfnt_off000119c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C4 10588 bytes
SHA-256: 5eb9769043860cc3ccdca2a31c6808033ca35213c089dee9e514ec1bac303b03
font_02_sfnt_off00013227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1